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Mathematics 4 Online
OpenStudy (anonymous):

The voltage of the electricity supply in North America can be modelled using a sine funtion. The maximum value of the voltage is about 120v. The frequency is 60 Hz. What is the amplitude.

OpenStudy (radar):

That 120 is the RMS (Root Mean Square) value. The amplitude is the peak value which is the RMS value multiplied by the square root of 2.

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