All AP Physics C Electricity Resources
Example Question #1 : Using Ohm's Law
A simple circuit consists of a resistor that's connected to a battery. How much power is dissipated by the resistor?
One of the formulas for power is . We are given the values of the voltage and resistance.
Using these values, we can solve for power.
Example Question #2 : Using Ohm's Law
What is the current delivered to the curcuit by the battery?
Using Ohm's law to solve for the value of the current from the battery requires calculation of the equivalent resistance of the circuit.
The resistors R2 and R3 are in parallel with one another. Once combined, their requivalent resistor (R23) is in series with R1.
The equivalent resistance is thus given by:
Use this value and the given voltage to solve for the current in the circuit: