Question

How many electrons are flowing per second past a point in a circuit in which there is a current of 4A?

Answer 1

Answer:

The number of electrons flowing per second past a point in a circuit in which there is a current of 4A is $n=3*10^{19}$

Explanation:

• The electric current is due to the flow of electron

• If (n) number of electrons are flowing in time (t), the current is given by the formula

       $I=\frac{ne}{t}$

where the electric charge $e=1.6*10^{-19}C$

From the question, we have

the current in the circuit is $I=4A$

the flowing time of electrons $t=1sec$

now the number of electrons $n=\frac{It}{e}$

⇒ $n=\frac{4}{1.6*10^{-19} } =2.5*10^{19}$

the value can be approximated as $n=3*10^{19}$