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The rms voltage of a house outlet is 120 V. I need a 3V source for...

The rms voltage of a house outlet is 120 V. I need a 3V source for my cell phone charger. The primary coil has 250 turns, how many turns does the secondary coil have?

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Input voltage = Ei= 12or out put voltage = Eo - 3 No. g turns in primary hi = 250 No. of turns in secondary: hf=? م بيا know

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