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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: AQA Physics (7408), A-level, 3.7.4.4 Capacitor charge and discharge and 3.7.4.3 Energy stored by a capacitor. Topic: Capacitors.

Key terms in this lesson

Motor effect: The force experienced by a current-carrying conductor placed in an external magnetic field, resulting from the interaction between the field and the field created by the current.
Magnetic flux: The product of the magnetic flux density and the area through which the field passes at right angles to it, measured in weber.
Magnetic flux linkage: The product of the magnetic flux through a coil and the number of turns on the coil.
Lenz's law: The direction of an induced current is always such as to oppose the change that produced it.

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