But first a little more about resistors. Power is the rate at which energy is delivered or consumed. Energy is force times distance, and force is mass times acceleration, where acceleration is the rate at which velocity is changing. Remember that a resistor is a power consuming device.
Electrical power has units of watts.
The power consumed by a resistor is equal to the product of the current flowing through the resistor times the voltage dropped across it. The equation above is referred to as the power equation. There are two other forms, both of which are derived from ohms law. The separating material is referred to as a dielectric . A capacitor stores energy, unlike the resistor, which consumes energy.