Question

A certain device in a 120-V circuit has a current rating of 20 A. What is the resistance of the device (how many ohms)?

Answer 1

Answer:

R = 60 Ω

Explanation:

given,

Potential of the certain device, V = 120 V

current rating of the circuit, I = 20 A

resistance of the device, R = ?

Using Ohm's Law

V = I R

$R = \dfrac{V}{I}$  

$R = \dfrac{120}{20}$  

R = 60 Ω

hence, the resistance of the device is equal to 60 Ω

Answer 2

Answer:

6 ohms

Explanation: