800W electrical device is designed to wort in 200V. What will be its power if the device
is working in 100V.
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= 200 W
Resistance of the appliance
R = V^2/P = 200 x 200/800
=50 Ω
Power when connected in 100 V
P = V^2/R = 100 x 100/50
= 200W
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