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

Power can be found using the equation: power = (voltage) 2 / resistance.

The general formula for power dissipation is:

Power = Current x Voltage

However, if you only know the voltage and the resistance, you can calculate the current using Ohm's Law, which is usually given as:

Voltage = Current x Resistance

However, you can rearrange this to give:

Current = Voltage/Resistance

You can then substitute this into the expression for power dissipation to yield an equation that gives an expression for power in terms of only voltage and resistance:

Power = / Resistance