787 Super Capacitor Super capacitors have very large capacitance (typically from 0.1 to 3000F), small sizes, and

Question:

7–87 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?

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