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Exponential Decay.

When the charge on capacitor C decreases by ΔQ through fixed resistor R in time Δt, I = V/R where V = Q/C. This means that I = Q/RC and ΔQ the change in charge becomes -QΔt/CR.The curves all have the same shape as the current is proportional to the charge and the charge is proportional to the potential difference.

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Specification: Edexcel Physics (9PH0), A-level, Topic 7: Electric and Magnetic Fields, statements 117 and 120. Topic: Capacitors.

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