High School Physics : Calculating Circuit Power

Study concepts, example questions & explanations for High School Physics

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Example Questions

Example Question #14 : Electricity And Magnetism

What is the power of a circuit with a current of  and a resistance of ?

Possible Answers:

Correct answer:


The standard equation for power is:


We are given only current and reistance, meaning we must manipulate this equation so that only those variables are present. To do this, we can substitute Ohm's law for voltage.

Now we have an equation for power that uses only current and resistance. Plug in the values given in the question to find the final answer.

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