The capacitance of a capacitor is given by the ratio of it’s charge to the P.D. across it’s plate. i.e.
capacitance formula =
Explanation when Capacitor In Series
Let, three capacitors are connected in series C1, C2 &C3. potential difference across the each capacitor is V1, V2 & V3 respectively.
Total voltage (v) = V1 + V2 + V3
Explanation When Capacitor In Parallel
Let three capacitors C1 , C2 & C3 are connected in parallel respectively by connected across P.D. now, charge on the capacitor C1
Q1 = C1V
If, C is the equivalent capacitance, of the circuit, the total charge
Q = C.V = Q1 + Q2 + Q3
= C1V + C2V + C3V
Q = V (C1 +C2 +C3)
C = C1 + C2 + C3
OR, Q = VC
C = Q/V
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