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A fully charged 98 uF capacitor is discharged through a 125 ohms resistor. How long will it take for the capacitor to lose 75% of its initial energy

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The time constant is RC = 0.0123 seconds

To lose 75% of its energy, the voltage on the capacitor must fall in half.

V/Vo = e^(-t/0.0123) = 0.500

Solve for t.

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