How much power is produced if a voltage of 4V



Answered question


How much power is produced if a voltage of 4V is applied to a circuit with a resistance of 27 Ω ?

Answer & Explanation

Lucille Lucas

Lucille Lucas

Beginner2022-05-19Added 16 answers

Probably not a lot more explanation needed. We are given a voltage (V) And a resistance ( Ω). We know that the expression for power in a circuit is P=VI, but we don't know the current.
We do know a way to find the current, given the voltage and the resistance: Ohm's Law :
I = V R
We could calculate the current and then substitute that into the expression for the power, but I decided to combine the equations instead:
P = V I = V ( V R ) = V 2 R
Then it's just a matter of substituting in the values we have and we know the power produced by the circuit.

Do you have a similar question?

Recalculate according to your conditions!

Ask your question.
Get an expert answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?