What are the internal resistance and voltage rating of a 450

What are the internal resistance and voltage rating of a 450 W automatic washer that draws 3.75 A from electrical supply?

Solution

Automatic washer is single phase system.

Given current drawn is I = 3.75 A

Power absorbed is P = V*I

Voltage V = P/I = 450/3.75 = 120 V

Internal resistance R = V/I = 120/3.75 = 32 ohm.