A capacitor stores electricity in a circuit and discharges it when needed. The main parts of a capacitor are two metal plates and an insulator called dielectric between them.

__Capacitance :__ Capacitance is the ability of a capacitor to store electric charges. It is the amount of charge required to create a unit potential difference between the plates.

Series and parallel connection of capacitors

**Series Combination :**

Three capacitors with capacitances C₁, C2 and C3 are connected in series one behind the other.

Let V₁, V2, and V3 be the potential drop across the three capacitors, V be the total applied voltage, and C be the total capacitance.

When connected in this way the charge Q flowing through them will be the same

In series connection,

V = V1 + V2 + V3

Otherwise

Q/C = Q/C₁ + Q/C₂ + Q/C3

(V = Q/c in capacitor)

Taking Q as a constant,

**1/C = 1/C₁ + 1/C2 + 1/C3**

__Parallel Combination:__If three capacitors of capacitances C₁, C2 and C3 are connected in parallel with voltage V then V will be constant across all capacitors. But the charge Q is divided across each of the capacitors Q1, Q₂ and Q3.

Q = Q1+Q2+Q3

= C1V + C2V+ C3V

=V(C1 +C₂ + C3)

If the total capacitance is V,

Q1+Q2+Q3 = V × C

Total capacitance = sum of capacitances.

that is,

**C = C + C₂ + C**

**Note :**

In a

**series combination of capacitors, the charge across all the capacitors is the same and the potential difference is different.**In__parallel combination the potential difference across each capacitor is the same and the charge is different.__
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