| ALPHA : Electricity : Capacitance 08 : Electrical Energy In A Capacitor : ALPHA Physics Homework Exercise
Description : Electrical energy in a capacitor.
Discussion : The energy stored in a capacitor is proportional to half the voltage squared, or half the charge squared. See Figure Direct Current Capacitance Charge And Energy
The homework exercise has 6 questions.
Energy From V
Energy From Q
Capacitance From V
Capacitance From Q
Voltage
Charge
The equations are :
Ec = 1/2 C V2 = 1/2 Q2 / C
where
Ec = energy stored by capacitor
V = voltage across capacitor
Q = charge stored in capacitor
C = capacitance
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