Question on: SS2 Physics - Electricity and Magnetism

In an RC circuit, the initial voltage across the capacitor is 12 volts. After one time constant, the voltage decreases to 3 volts. What is the percentage of voltage remaining after one time constant?

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Percentage of voltage remaining = (Voltage after one time constant / Initial voltage) x 100% = (3 volts / 12 volts) x 100% = 25%

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