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how much current is required for a 12v,15w bulb ? Answered

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Watts=current x voltage so to derive current from watts and voltage you:

Current = Watts / Volts

Or in your case I= 15/12 = 1.25 amps

This is basic Ohms law. If you don't know it then you should learn it. Power(W) is Voltage (V or E) multiplied by Current (I). So to solve for current: I=W/V.

Another helpful basic equasion from Ohms Law is V=I*R