I forget the math?
P=IxE and E=IxR so P=IxIxR? 7KW=IxIx50 7000/50=IxI 140=IxI
140=me twice
Damn now I've got a headache!

P=I^2R so assuming a properly matched load, P/50=I^2 and I is about 12A.

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KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR