How can you find this: i need

how much power a circuit will generate if you know the voltage and resistance but not the current.

Law provides the formula to determine any of the three components in a circuit voltage=E Resistance=R and Current =I so with any two you can figure out

The third.I=E/R E=IxR=E/I so to find I use I=E/R so you divide the resistance.
into the voltage and you have the current (in amps)or power

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