# Power and Voltage

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What happens to the power used by an electric appliance if the voltage across this appliance is decreased to half of the original value?

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Solution.

Denote the current voltage and the original voltage across this appliance by V2 and V1, respectively. Assume that the resistor of this appliance is R. Then the ...

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This solution provides in 131 words a calculation for current and original voltage to find power.

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