Question

Calculate the energy stored in a 5uf capacitor charge to 30 V

Answer 1

The information given is

The capacitance is $C=5\mu F\\$

The capacitor voltage is $V=30\;V$

The stored energy is given by

$U=\dfrac{1}{2}\;C\;V^{2}$

Evaluating numerically

$U=\dfrac{1}{2}\;5\;\mu\;(30\;V)^{2}=2250\;\mu\;J$

The energy stored by the capacitor is

$U=2250\;\mu\;J$