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Electronic Formulas / Formulae

Capacitance Formula Calculation

When a voltage is applied to a circuit containing capacitance, current flows to accumulate charge in the capacitance:

Q = ˛idt = CV

Alternatively, by differentiation with respect to time:

dq/dt = i = C dv/dt

Note that the rate of change of voltage has a polarity which opposes the flow of current.

The capacitance C of a circuit is equal to the charge divided by the voltage:

C = Q / V = ˛idt / V

Alternatively, the capacitance C of a circuit is equal to the charging current divided by the rate of change of voltage:

C = i / dv/dt = dq/dt / dv/dt = dq/dv

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