Energy Stored in a Condenser

Author: E.E. Kimberly

The instantaneous power in the circuit of Fig. 8-7 (a) is

(8-10)

The power in the resistance only is

(8-11)

or

The energy stored in the condenser at any time t after the circuit is closed is proportional to the area under a graph plotted from equation (8-12) from t = 0 to time t. The final steady-state energy in the condenser is

or

When the condenser is fully charged and the circuit is opened, the energy remains in storage to do useful work.