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Understanding rms values and peak values of voltage/current

A personal computer that has a built in monitor and keyboard requires 40W at 115V(RMS). What is the rms value of the current carried by the power cord?Can you show me how to solve this problem?

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With AC voltage, two terminologies are used for voltage, the RMS (Root Mean Square) voltage and the peak voltage. They are related according ...

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Very detailed solution with all steps.