Question

a 800 watt electrical device is designed to working 200 volt. what will be its power if the device is working 100 volt​

Answer 1

Answer:

Explanation:

use Ohm’s Law (V=IR) and “Watt’s Law” (W=VI)

At 200V it is drawing 4A, and its resistance is 50 ohms.

At 100V with 50 ohms you get 2A.

100V, 2A means 200W

Or you could argue that power is proportional to V^2 and eventually get the same answer.

All this assumes the resistance doesn’t change.