Asked/Added Questions From NCERT:

Question 1. Asked on :05 August 2020:05:51:20 PM

Write the identity 5?

-Added by Shruti Srivastva Mathematics » Current Electricity

Answer:

Shruti Srivastva
(x+y+z)²= x² + y² + z² + 2xy+2yz+2xz

-Answered by Shruti Srivastva On 05 August 2020:05:51:46 PM

Question 2. Asked on :05 August 2020:05:49:05 PM

Write the identity 3?

-Added by Shruti Srivastva Mathematics » Current Electricity

Answer:

Shruti Srivastva

(a+b)(a-b) = a²-b²

-Answered by Shruti Srivastva On 05 August 2020:05:49:30 PM

Question 3. Asked on :05 August 2020:05:36:53 PM

A (i) series (ii) parallel combination of two given resistor is connected one-by-one, across a cell. In which case will the terminal potential diference, across the cell, have a higher value?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
In the case of series combination of the two given resistors, the terminal p.d. will have a higher value.

-Answered by Shruti Srivastva On 05 August 2020:05:39:44 PM

Question 4. Asked on :05 August 2020:05:34:59 PM

Write the differnce between a heating wire and a fuse wire?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The melting point of a heater wire is very high while that of a fuse wire is low.

-Answered by Shruti Srivastva On 05 August 2020:05:35:41 PM

Question 5. Asked on :05 August 2020:05:33:30 PM

What is the diernce between a heater wire and a fuse wire?

-Added by Shruti Srivastva Physics » Current Electricity

Question 6. Asked on :05 August 2020:05:31:50 PM

What are the characterstics of fuse wire?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
A fuse wire must have high restivity and low melting poit.

-Answered by Shruti Srivastva On 05 August 2020:05:32:32 PM

Question 7. Asked on :05 August 2020:05:29:50 PM

Write two special characterstics of the wire of an electric heater?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
(i) High melting poimt.

(ii) High resistivity.

-Answered by Shruti Srivastva On 05 August 2020:05:30:56 PM

Question 8. Asked on :05 August 2020:05:27:22 PM

What do you mean by the maximum power rating of a resistor?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

The maximum power rating of a resistor is the maximum power that it can dissipate in the form of heat without undergoing melting.

-Answered by Shruti Srivastva On 05 August 2020:05:28:28 PM

Question 9. Asked on :05 August 2020:05:23:36 PM

Which has a grater resistance-kW electric heater or a 100 W filament bulb both are marked or 220 V?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Resistance of heater = 48.4 Ω

Resistance of bulb = 484 Ω

Thus the 100 W bulb has a greater resistance.

-Answered by Shruti Srivastva On 05 August 2020:05:25:23 PM

Question 10. Asked on :05 August 2020:05:20:43 PM

Distinguish between kilowatt and kilowatt hour?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Kilowatt is the unit of electric power while kilowatt hour is the unit of electric energy.

-Answered by Shruti Srivastva On 05 August 2020:05:22:35 PM

Question 11. Asked on :05 August 2020:05:17:10 PM

Two resistor of 2Ω and 4Ω are connected in parrallel to a constant d.c. voltage. In which case more heat is produced?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The heat produced in 2Ω resistor is more than that on 4Ω resistor.

-Answered by Shruti Srivastva On 05 August 2020:05:19:13 PM

Question 12. Asked on :05 August 2020:05:14:37 PM

A heating element is marked 210 V, 630 W. What is the value of the current drawn by the lement when connected to a 210 V dc source?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
3 A.

-Answered by Shruti Srivastva On 05 August 2020:05:16:44 PM

Question 13. Asked on :05 August 2020:05:12:05 PM

A heating element is marked 210 V, 630 W. Find the resistance of the element when connected to a 210 V dc source?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
70 Ω.

-Answered by Shruti Srivastva On 05 August 2020:05:13:52 PM

Question 14. Asked on :05 August 2020:05:09:40 PM

How much charge flows through a 250 V, 1,000 W heater in one minute?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
240 C.

-Answered by Shruti Srivastva On 05 August 2020:05:11:11 PM

Question 15. Asked on :05 August 2020:05:07:53 PM

What is the saest voltage you can safely put across a 98 Ω, 0.5 W resistor ?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

7 V.

-Answered by Shruti Srivastva On 05 August 2020:05:09:21 PM

Question 16. Asked on :05 August 2020:05:05:40 PM

The maximum power dissipated in a 10,000 Ω resistor 1W. What is the maximum current?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

0.01 A

-Answered by Shruti Srivastva On 05 August 2020:05:07:26 PM

Question 17. Asked on :05 August 2020:05:04:06 PM

How many kilowatts hours are there in one joule?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
2.778 x 10^-7 kilowatt.

-Answered by Shruti Srivastva On 05 August 2020:05:04:51 PM

Question 18. Asked on :05 August 2020:05:01:07 PM

How many joules of energy are equivalent to 1 KWh?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
1 KWh = 1 Killowatt x 1 hour

= 1000 watt x 3600 s = 3.6 x 10⁶j.

-Answered by Shruti Srivastva On 05 August 2020:05:02:35 PM

Question 19. Asked on :04 August 2020:06:31:43 PM

What do you mean by 1 unit of electric energy in domestic use?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

1 unit of electricity - 1 KWH. This mean that when an appliance of power 1000 watt is opreated on main for 1 hour, it consumes 1 unit of electric energy.

-Answered by Shruti Srivastva On 04 August 2020:06:32:03 PM

Question 20. Asked on :04 August 2020:06:31:15 PM

Of which physical quantity is the unit kilowatt hour?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Kilowatt hour is the unit of electrical energy.

-Answered by Shruti Srivastva On 04 August 2020:06:31:33 PM

Question 21. Asked on :04 August 2020:06:28:13 PM

How is electric energy is realted to electric power?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Electric energy = Electric Power x time.

-Answered by Shruti Srivastva On 04 August 2020:06:31:03 PM

Question 22. Asked on :04 August 2020:06:27:34 PM

The rate of the production of heat is given by P = VI. Is this relation valid for a non-ohmic conductor?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Yes, it is valid.

-Answered by Shruti Srivastva On 04 August 2020:06:28:03 PM

Question 23. Asked on :04 August 2020:06:26:56 PM

Current 1 flows through a potential drop V across a conductor, What is the rate of production of heat?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Rate of production of heat is P = VI

-Answered by Shruti Srivastva On 04 August 2020:06:27:15 PM

Question 24. Asked on :04 August 2020:06:26:06 PM

If the resistance in the three succesive arms of a balanced Wheatstone bridge, are 1,2 and 36Ω respectively, what will be the resistance of the galvonometer placed in the fourth arm?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Superconductivity.

-Answered by Shruti Srivastva On 04 August 2020:06:26:45 PM

Question 25. Asked on :04 August 2020:06:14:29 PM

Write the principle of working of a metre bridge?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

The working of a metre bridge is based on the principle o Wheatstine bridge.

When the bridge is balanced = PQ

= RS

-Answered by Shruti Srivastva On 04 August 2020:06:14:49 PM

Question 26. Asked on :04 August 2020:06:14:02 PM

What is a wheatstone bridge?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

A wheatstone bridge is an arragement of four resistance used to determine quickly and accurately one of these resistance in terms of other three resistance.

-Answered by Shruti Srivastva On 04 August 2020:06:14:19 PM

Question 27. Asked on :04 August 2020:06:13:31 PM

Write the SI unit of potential gradient?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Its SI unit is volt per metre

-Answered by Shruti Srivastva On 04 August 2020:06:13:54 PM

Question 28. Asked on :04 August 2020:06:12:59 PM

Define potential gradient?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The potential drop per unit length of the potentiometer wire is known as its potential gradient.

-Answered by Shruti Srivastva On 04 August 2020:06:13:18 PM

Question 29. Asked on :04 August 2020:06:12:21 PM

Name the devic used for measuring the internal resistance of a secondary cell?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Potentimeter

-Answered by Shruti Srivastva On 04 August 2020:06:12:48 PM

Question 30. Asked on :04 August 2020:05:51:29 PM

Name thw device used for measuring the emf of a cell.

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Potentimeter

-Answered by Shruti Srivastva On 04 August 2020:06:11:57 PM

Question 31. Asked on :04 August 2020:05:47:28 PM

On what conservation principle is the kirchoff's second law based?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Law conservation of energy.

-Answered by Shruti Srivastva On 04 August 2020:05:51:03 PM

Question 32. Asked on :04 August 2020:05:45:52 PM

On what conservation principle is the Kirchhoff's first law based?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Law conservation of charge.

-Answered by Shruti Srivastva On 04 August 2020:05:46:52 PM

Question 33. Asked on :04 August 2020:05:43:39 PM

Can Kirchhhof's laws be applied to the both d.c. and a.c. circuits?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Yes, Kirchhoff's laws be applied to the both d.c. and a.c. circuits

-Answered by Shruti Srivastva On 04 August 2020:05:45:14 PM

Question 34. Asked on :04 August 2020:05:38:13 PM

A 4 Ω non-insulated resistance wire is bent 180º in the middle and the two halves are twisted together. What will be its new resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The length of the wire becomes half of the original length while area o cross-section is doubled.

R' = 14

R = 14 X 4

= 1 Ω

-Answered by Shruti Srivastva On 04 August 2020:05:40:45 PM

Question 35. Asked on :04 August 2020:05:36:39 PM

Give an example of non-ohmic device which shows up negative resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Thyristor.

-Answered by Shruti Srivastva On 04 August 2020:05:37:43 PM

Question 36. Asked on :04 August 2020:05:33:59 PM

What is a linear resistor?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
A linear asistor one which obeys Ohm's law or for which voltage-current graph is a straight line passing through origin.

-Answered by Shruti Srivastva On 04 August 2020:05:34:57 PM

Question 37. Asked on :31 July 2020:06:46:30 PM

Give an example of non-ohmic device?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Semiconductor.

-Answered by Shruti Srivastva On 04 August 2020:05:33:43 PM

Question 38. Asked on :31 July 2020:06:44:36 PM

What is non-ohmic device?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

A device which does not obey Ohm's law is called non-ohmic device.

-Answered by Shruti Srivastva On 31 July 2020:06:45:24 PM

Question 39. Asked on :31 July 2020:06:42:10 PM

How is the conductivity of an electrolyte affected by the increase of temperature?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The conductivity of an electrolyte increases with the increase in its temperature.

-Answered by Shruti Srivastva On 31 July 2020:06:43:24 PM

Question 40. Asked on :31 July 2020:06:40:03 PM

Name two parameters which determine the restivity of a material?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
(i) Its number density of free electrons.

(ii) The relaxation time.

-Answered by Shruti Srivastva On 31 July 2020:06:41:07 PM

Question 41. Asked on :31 July 2020:06:38:10 PM

How does the resistance of an insulator change?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The resistance of an insulator decreases with the increase of temperature.

-Answered by Shruti Srivastva On 31 July 2020:06:39:02 PM

Question 42. Asked on :31 July 2020:06:36:16 PM

How does resistivity of alloy manganin change with temperature?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The resistivity of alloy manganin is nearky independent of temperature.

-Answered by Shruti Srivastva On 31 July 2020:06:37:11 PM

Question 43. Asked on :31 July 2020:06:34:38 PM

Of copper and nichrome, which one has possibly large value of temperature coefficient of resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Copper.

-Answered by Shruti Srivastva On 31 July 2020:06:36:03 PM

Question 44. Asked on :31 July 2020:06:31:39 PM

How does the conductance of a semi-conducting material change with rise in temperature?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

With the rise in temperature, the conductance of a semi-conducting material increases exponentially.

-Answered by Shruti Srivastva On 31 July 2020:06:33:16 PM

Question 45. Asked on :31 July 2020:06:29:44 PM

Name two materials whose resistivity decreases with the rise of the temperature?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Germanium and silicon.

-Answered by Shruti Srivastva On 31 July 2020:06:31:11 PM

Question 46. Asked on :31 July 2020:06:25:47 PM

How does one explain increase in resistivity of a metal with increase of temperature?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
With the increace in tempreature, the relaxation time π decraces and

hence resistivity (p= mne^2 π ) increaces.

-Answered by Shruti Srivastva On 31 July 2020:06:27:06 PM

Question 47. Asked on :31 July 2020:06:22:42 PM

Write the expressions for the 'drift velocity' of charge carries in a conductor and write its relationship with the current flowing through it.

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

v_d = evtml

-Answered by Shruti Srivastva On 31 July 2020:06:24:40 PM

Question 48. Asked on :31 July 2020:06:19:56 PM

How does the random motion of free electrons in a conductor get affected when a potential difference is applied across its ends?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Random motion gets patiallly directed towards the higher potential side.

-Answered by Shruti Srivastva On 31 July 2020:06:21:45 PM

Question 49. Asked on :31 July 2020:06:18:33 PM

Define tempreature coefficient of restivity?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Anjali Kumari

he temperature coefficient of resistance is defined as the change in resistance per unit resistance per degree rise in temperature based upon the resistance at $0^{o}$ C.

-Answered by Anjali Kumari On 13 October 2020:07:34:49 PM

Question 50. Asked on :31 July 2020:06:16:45 PM

What is the order of restivity of conductor?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Conductor of restivivties less than 10^-6 Ω m.

-Answered by Shruti Srivastva On 31 July 2020:06:17:32 PM

Question 51. Asked on :31 July 2020:06:12:29 PM

Give the order of magnitude of the number density of free electrons in a metal?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Number density of free elctrons in a metal = 10²⁹_m-3_.

-Answered by Shruti Srivastva On 31 July 2020:06:14:05 PM

Question 52. Asked on :31 July 2020:06:08:54 PM

Give the order of magnitude of thermal velocity and drift velocity of free elctrons in a conductor carrying current at room temperature?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Thermal velocity of free electrons = 10⁵ ms^-1.

Drift velocity of free electrons = 1 m ms^-1.

-Answered by Shruti Srivastva On 31 July 2020:06:10:44 PM

Question 53. Asked on :31 July 2020:06:07:00 PM

What is the average velocity of free electrons in a metal at room temperature?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Zero.

-Answered by Shruti Srivastva On 31 July 2020:06:08:37 PM

Question 54. Asked on :31 July 2020:06:05:24 PM

What is the ratio of the restivity of a typical insulator to that of a metal?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The ratio of 10²².

-Answered by Shruti Srivastva On 31 July 2020:06:06:34 PM

Question 55. Asked on :31 July 2020:06:01:44 PM

What is the order of resistivity of an insulator?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The restivity of an insulator like glass or rubber is of the order of 10⁸ - 10¹⁵ Ωm.

-Answered by Shruti Srivastva On 31 July 2020:06:02:59 PM

Question 56. Asked on :31 July 2020:06:00:18 PM

Write the SI unit of restivity of a material?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Its SI unit is ohmΩ.

-Answered by Shruti Srivastva On 31 July 2020:06:01:10 PM

Question 57. Asked on :31 July 2020:05:58:18 PM

Define resistivity of a material?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The restivity of a material is the resistance offered by a unit of cube of that material.

-Answered by Shruti Srivastva On 31 July 2020:05:59:07 PM

Question 58. Asked on :31 July 2020:05:57:21 PM

Which metal has the lowest restivity?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Silver.

-Answered by Shruti Srivastva On 31 July 2020:05:58:01 PM

Question 59. Asked on :31 July 2020:05:55:40 PM

How much is the resistance of a closed pug key?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Negilibily small.

-Answered by Shruti Srivastva On 31 July 2020:05:56:54 PM

Question 60. Asked on :31 July 2020:05:54:31 PM

How much is the resistance of a an air-gap?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Infinity.

-Answered by Shruti Srivastva On 31 July 2020:05:55:29 PM

Question 61. Asked on :31 July 2020:05:52:29 PM

Deine electrical conductivity of a material?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The conductivity of a material is equal to the reciprocal of its resistivity.

-Answered by Shruti Srivastva On 31 July 2020:05:53:23 PM

Question 62. Asked on :31 July 2020:05:49:30 PM

Define conductance of a material?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The ease with which a conductor allows a current to flow through it is called its conductance It is equal to the reciprocal of resistance.

-Answered by Shruti Srivastva On 31 July 2020:05:50:20 PM

Question 63. Asked on :31 July 2020:05:47:39 PM

Write the SI unit of conductivity?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Its SI unit is ohm^-1 m^-1 or mho m^-1.

-Answered by Shruti Srivastva On 31 July 2020:05:48:30 PM

Question 64. Asked on :31 July 2020:05:46:09 PM

Write the relation between conductance an resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Conductance = 1Resistance

-Answered by Shruti Srivastva On 31 July 2020:05:46:48 PM

Question 65. Asked on :31 July 2020:05:43:37 PM

What is the relation between conductivity and resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Conductivity = 1Resistance

-Answered by Shruti Srivastva On 31 July 2020:05:44:40 PM

Question 66. Asked on :31 July 2020:05:41:19 PM

Give SI unit of conductance of a material?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Its SI unit is mho or ohm^-1.

-Answered by Shruti Srivastva On 31 July 2020:05:42:39 PM

Question 67. Asked on :31 July 2020:05:39:16 PM

Write the formula for 1 ohmΩ?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

1Ω = 1V1A .

-Answered by Shruti Srivastva On 31 July 2020:05:40:02 PM

Question 68. Asked on :31 July 2020:05:37:50 PM

Define ohm ?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The resistance of a conductor is said to be 1 ohm.

-Answered by Shruti Srivastva On 31 July 2020:05:38:19 PM

Question 69. Asked on :31 July 2020:05:37:04 PM

Define resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Anjali Kumari
Resistance (also known as ohmic resistance or electrical resistance) is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). When a voltage is applied across a substance there will be an electric current through it

-Answered by Anjali Kumari On 13 October 2020:07:33:56 PM

Question 70. Asked on :31 July 2020:05:35:52 PM

Write the formula fo resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

R = V1

-Answered by Shruti Srivastva On 31 July 2020:05:36:21 PM

Question 71. Asked on :31 July 2020:05:33:46 PM

Write the SI unit of resistance?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

ohmΩ.

-Answered by Shruti Srivastva On 31 July 2020:05:34:29 PM

Question 72. Asked on :31 July 2020:05:30:59 PM

Name the colours corresponding to the digit 4 and 7 in the colour code scheme or carbon resistors?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Yellow and violent respectively.

-Answered by Shruti Srivastva On 31 July 2020:05:33:16 PM

Question 73. Asked on :31 July 2020:05:27:30 PM

State Ohm's law?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Ohm's law states that the electric current I passing through a conductor is proportional to the potential difference V applied across its ends, provided the temperature and other physical condition remains unchanged.

-Answered by Shruti Srivastva On 31 July 2020:05:28:12 PM

Question 74. Asked on :31 July 2020:05:24:57 PM

Define an emf of one volt?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
If an electric cell supplies an energy of 1 joule for the flow of 1 coulomb of charge through the whole circuit, then its emf is said to be 1 volt.

-Answered by Shruti Srivastva On 31 July 2020:05:25:47 PM

Question 75. Asked on :31 July 2020:05:23:21 PM

Write the SI unit of emf current?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
Its SI unit is volt.

-Answered by Shruti Srivastva On 31 July 2020:05:24:33 PM

Question 76. Asked on :31 July 2020:05:20:33 PM

Write the SI unit of electric current?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

ohm Ω.

-Answered by Shruti Srivastva On 31 July 2020:06:16:23 PM

Question 77. Asked on :31 July 2020:05:16:19 PM

State the condition in which terminal voltage across a secondary cell is equal to its emf?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
When no current is drawn from the cell, its terminal voltage is equal to its emf.

-Answered by Shruti Srivastva On 31 July 2020:05:18:11 PM

Question 78. Asked on :31 July 2020:05:12:27 PM

What is electromotive force?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The work done per unit charge by a source in taking the charge once around the complete circuit is called electromotive force or emf of the force.

-Answered by Shruti Srivastva On 31 July 2020:05:14:19 PM

Question 79. Asked on :31 July 2020:05:05:25 PM

What does the direction of electric current signify in an electric current?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The direction of conventional current in an electric circuit tells the direction of flow of positive charges in that circuit.

-Answered by Shruti Srivastva On 31 July 2020:05:08:57 PM

Question 80. Asked on :31 July 2020:01:47:21 PM

Wite the relation between coulomb and ampere?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

1 ampere = 1coulomb1second

-Answered by Shruti Srivastva On 31 July 2020:01:47:58 PM

Question 81. Asked on :31 July 2020:01:45:52 PM

Write the SI unit of electric current?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
ampere is the SI unit of electric current.

-Answered by Shruti Srivastva On 31 July 2020:01:46:36 PM

Question 82. Asked on :31 July 2020:01:43:43 PM

Write the formula for electric current?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva

Electric current= Total charge flowing Time taken

I = qt

-Answered by Shruti Srivastva On 31 July 2020:01:44:20 PM

Question 83. Asked on :31 July 2020:01:39:42 PM

Define electric current?

-Added by Shruti Srivastva Physics » Current Electricity

Answer:

Shruti Srivastva
The electric current is defined as the rate flow of electric charge through any section of a conductor.

-Answered by Shruti Srivastva On 31 July 2020:01:42:09 PM

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