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23 October, 18:54

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

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  1. 23 October, 18:57
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    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
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