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What Steelmonster said is pretty right it all boils back to Ohms Law and I have recently done just such a set of calculations. If you use the these formulai you will be ok but you will have to jiggle them around a bit to suit what you hope to obtain and the info that you have available. If ohms law isn't right nuthins right. Amps = Volts/ohms Watts = Volts X Amps. Make sure you get you decimal places correct. Rgds Ian
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