Question

What fraction of the energy drawn from the charging battery is stored in a capacitor?

Options

• 75%

• 100%

• 25%

• 50%

Answer 1

50%

Explanation:

Energy stored in a capacitor is given by

U = `1/2`qV ..............(i)

The total energy of the battery is given by

U' = charge × potential = qV

So, equation (i) can be written as

U = `"U"^'/2` = 50% of the total energy drawn from the charging battery.