Assuming that the charge of an electron is 1.6 × 10^-19 C, the number of electrons passing through a section of wire per second when the wire carries a current of 1 A is:

Question

Question

This question was previously asked in

RRB ALP CBT I 17 Aug 2018 Shift 3 Official Paper

Answer 1

The correct answer is 6.25 x10¹⁸.

Key Points

Given:
- Current, I = 1A
- Time = 1s
Using the formula,
- Q = I x T
- Q = 1 x1
- C = 1
Now if the charge is 1.6 x 10^-19C, the number of electron is 1.So, if the charge is 1 C, the number of electron given by-
- 1/(1.6 x 10^-19) x 1
- 6.25 x 10¹⁸
Thus, 6.25 x 10¹⁸ electrons should pass through a conductor in one second to constitute 1 ampere current.

Additional Information

Electric Current:
- Electric current in basic terms is the flow of electric charge.
- Common charge carriers are electrons, but they can also be ions as in the case of a chemical battery.
- The unit of amperage in the SI system is the ampere (A), 1 ampere is the amperage when a charge of 1 coulomb passes through the cross-section for 1 second.