# Kirchhoff's Voltage Law (KVL)

Kirchhoff Voltage Law states that ''The algebraic sum of all voltages (source voltage and voltage drops) is equal to zero around a close path''.

In the above circuit R_{1}, R_{2} and R_{3} are three resistors connected in series across a voltage source V. V_{I }, V_{2 }and V_{3} are voltage drops across resistors R_{1}, R_{2} and R_{3} respectively. So according to Kirchhoff voltage law

V + ( -V_{1 }) + ( -V_{2} ) + ( -V_{3 }) = 0

V - V_{1 }- V_{2 }- V_{3} = 0

V = V_{I }+ V_{2 }+ V_{3}

This is called KVL ( Kirchhoff Voltage Law) equation.

V = V_{I }+ V_{2 }+ V_{3}

Applied voltage = sum of all voltage drops

**OR**

The source voltage is equal to the sum of all voltage drops.

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