Question

A capacitor has a total charge of 6 μC stored. If it were possible to transfer this charge uniformly through a light with a current of 100 mA, how long would the light stay lit?

Answer 1

We know that the charge is current times time:

$$Q=It,\\ \space\\ t=\frac{Q}{I}=\frac{6\cdot10^{-6}}{100\cdot10^{-3}}=6\cdot10^{-5}\text{ s}.$$