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While you can't exactly compare the two, the equivalent voltages, currents and powers can worked using the idea of RMS (which is the equivalent value in AC); this is the value which is given for just about everything you plug in: microwaves, toasters, shavers... Just calculate "DC x square root of half = equivalent value of AC". The opposite is "AC x square root of two = DC". For example, 240 Volts (normal home voltage) AC x sqrt 2 = about 340 Volts DC or 6mA DC (the amount needed to stop a human heart) x sqrt 0.5 = 4.2 mA AC.

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