Super Capacitor Super capacitors have very large capacitance (typically from 0.1 to 3000F), small sizes, and very long charge-holding times, making them useful in nonbattery backup power applications.
The charge-holding quality of a super capacitor is measured using the circuit in Figure P7-87. The switch is closed for a long time (say, 24 h) and the capacitor charged to 5 V.
The switch is then opened and the capacitor allowed to self-discharge through any leakage resistance for 24 h.
Suppose that after 24 h the voltage across a 100-F super capacitor is 4:75 V. What is the equivalent leakage resistance in parallel with the capacitor?
