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Energy Stored in a Condenser

Author: E.E. Kimberly

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

ee_001-271.png (8-10)

The power in the resistance only is

ee_001-272.png (8-11)

The power or rate of storage of energy in the electric field of the condenser is




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



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

Last Update: 2010-10-05