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Considering an incandescent bulb and using P=VxI

P= Power Watts

V= Volts

I= Current (amperes)

I=P/V

I=75Watts/120Volts = 0.625 Amperes (A or Amps)

Therefore the current through a 75watt bulb that is connected to a 120volt circuit is 0.625 amps.

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