## Voltage Drop Formula :

Voltage Drop Formula V_{(v)} in volts is equal to the current I_{(A)} in Ampere and multiply the impedance Z_{(ohm)} in ohm. Hence the Voltage Drop Formula can be written as

**V _{(v)}=I_{(A)}* Z_{(ohm)}**

Where,

I→ current in amperes

Z→ impedance in ohm

## Sample Sums :

### Sums 1:

Calculate the voltage drop across the circuit? In a current of 8A flows through a circuit that carries a resistance of 30 Ω.

### Solution :

Given,

Current I=8A

Impedance z=30 Ω

The voltage drop formula is given by

V=Iz

=8*30

V=240V

### Example 2 :

Calculate the voltage drop? In a lamp of 10 Ω and 20 Ω are connected in series. A current of 5 A is made to flow through it.

### Solution :

Resistance z=(10+20) Ω

Z=30 Ω

Current I=5A

The voltage drop formula is given by

V=I*z

=5*30=150V