on an electrical appliance it is marked 800w and 400v. Find the power of the device when the volt is decreased into 200v
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Answer:
Power = Voltage*current
W = VI
W = 400 W
Explanation:
Given
W1 = 800W
V1 = 400V
therefore
I = W1/V1
I = 800/400
=2
now , power at 200 V
W = VI
= 200*2
W = 400 W
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