I would combine two laws I have memorised here: Ohm's Law, V=IR and the Power Law P=VI I have a current, I, of 8 A (ampere) and a power, P, of 14W (watt). i have been asked for a resistance, (ohm). So I want a formula that includes only those three things. If I want to get rid of the V in the Power Law, I can replace it with what Ohm's Law says is equal to V=IR. So
I need to rearrange to make R the subject, so I divide both sides by and swap the sides: (rounded to two decimal places).