Question

__ electrons pass through a lamp in one minute if the current is 200 mA.

Answer 1

Charge, q = It = $200\times {10}^{-3}\times 60$ = 12 C

We know that, q = ne

So no. of electrons, n = $\frac{q}{e}$ = $\frac{12}{1.6\times {10}^{-19}}$ = $7.5\times {10}^{19}$