All AP Physics C: Mechanics Resources
Example Question #1 : Calculating Circuit Power
A simple circuit contains two resistors in parallel, connected to a 20V source. What power is being provided by the source to the circuit?
The power supplied to the circuit can be calculated using the equation:
To use this equation, we need to find the equivalent resistance of the circuit. Use the equation for equivalent resistance in parallel:
Now that we have the resistance and the voltage, we can solve for the power.