Calculating Applied Voltage in an Electric Circuit

11 Oct 2021

What is the applied voltage in a circuit where a current of 9 A flows through an electric device with a resistance of 43 Ω?

A. 4.8 V

B. 387 A

C. 387 V

D. 4.8 A

The correct option is (C) 387 V

Solution:

Given:

Electric current = 9 A

Resistance = 43 ohms

Using Ohm's Law:

V = I x R

Where:

V = applied voltage

I = electric current

R = resistance

Plugging in the values:

V = 9 A x 43 Ω = 387 V

Therefore, the applied voltage in the circuit will be 387 V.