what is the ment by electric current ? name and define it's SI units In a conductor electrons all flowing form B to A . what is the direction of conventiand current ? given fustification of your answer.
A steady current of 1 Ampere flow through a conductor callulate the Number of celeetrons that flows through Any section of the conductor in 1 second ?
Answers
Solution:
Electric current is defined as the number of charges that flow through any cross section of a conductor in a given amount of time.
The S.I. unit of current is ampere denoted by the symbol A.
1 A is defined as the flow of 1 coulomb of charge in 1 second.
Conventional direction of current is defined as the direction opposite to the flow of electrons. According to the question, electrons are moving from B to A, hence conventional direction of current is from A to B.
By formula, we can express current as:
- I = q/t
where, q is the amount of charge and t is the time taken. Charge q is also expressed as:
- q = ne
where, n refers to the number of electrons and e refers to 1.6 * 10^-19 C.
According to the question,
- 1 A = q / 1 sec
Therefore q = 1 coulomb.
Hence number of electrons flowing is given as:
=> q = ne
=> 1 C = n * 1.6 * 10^-19
=> n = 1 C / 1.6 * 10^-19
=> n = 6.25 * 10^18 electrons
This is the required answer. Hope it helped!