# Capacitance

A capacitor is a device capable of storing electric charge. The charge on a capacitor is given by the relationship:

charge = capacitance x applied p.d.

Q = CV

Capacitors in series:

Capacitors in parallel: C = C1 + C2 + C3 + ……

When a capacitor is connected in series with a resistor across a DC supply, there will be a finite time before the capacitor is fully charged. The final p.d. across the capacitor will be the supply voltage, and the final current zero. The time constant is a measure of this time lapse.

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