Question

0. A 1700-W machine operates at 120 V. What i

machine operates at 120 V. What is the resistance in the machine?
A. 7.1 x 1022 ohms
B. 1.2 x 1021 ohms
C. 1.4 ohms
D. 8.5 ohms

Answer 1

Option D

The resistance in machine is 8.5 ohms

Solution:

Given that,

Power = 1700 W

Voltage = 120 V

We have to find the resistance in machine

The formula used is:

`P = (V^2)/(R)`

Where,

"P" is the electric power and "V" is the voltage and "R" is the resistance

Substituting the given values we get,

`1700 = (120^2)/(R)\\\\1700 = (14400)/(R)\\\\R = (14400)/(1700)\\\\R = (144)/(17)\\\\R = 8.47 \approx 8.5`

Thus resistance in machine is 8.5 ohms