First slide

electric current

Question

A current of 4.8 amp. is flowing in a conductor. The number of electrons flowing per second through the conductor will be

Moderate

A

3 x 10¹⁹ electrons/sec
B

76 .8 x 10²⁰ electrons/sec
C

7.68 x 10²⁰ electron/sec
D

3 x 10²⁰ electrons/sec

Solution

$\begin{array}{l} i = \frac{q}{t} = \frac{ne}{t} or n = \frac{it}{e} \\ ∴ n = \frac{4 \cdot 8 \times 1}{1 \cdot 6 \times 10^{- 19}} = 3 \times 10^{19} electrons/sec \end{array}$

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