Capacitor charge and discharge (AQA A-Level Physics): Quizzes

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Capacitor charge and discharge
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How do voltage, current, and charge change when a capacitor discharges through a resistor?

They all decrease exponentially

What components are needed to charge a capacitor?

Power source and resistor

What happens when a capacitor is fully charged?

PD equals supply & current drops to zero

What circuit setup is needed to discharge a capacitor?

Closed circuit with only a resistor

After one time constant RCRC, what percentage of the original charge remains during discharge?

37%

After one time constant RCRC, what percentage of maximum charge is reached during charging?

63%

What is the formula for the time constant τ\tau of an RCRC circuit?

τ=RC\tau = RC

What is the half-life T1/2T_{1/2} for capacitor discharge in terms of RR and CC?

T1/2=0.69RCT_{1/2} = 0.69RC

Which equation describes voltage during capacitor charging?

V=V0(1−e−tRC)V = V_0 (1 - e^{\frac{-t}{RC}})

What is the gradient of a ln⁡Q\ln Q vs tt graph for capacitor discharge?

−1RC-\frac{1}{RC}

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