Power is defined as what?

• A. The energy stored in a component.
• B. The rate of doing work.
• C. The amount of charge moved per second.
• D. The total energy in the circuit.

Answer: (B)

Power is the rate at which energy is transferred or work is done. In electrical terms, it shows how quickly a circuit delivers energy to a load, and it’s calculated as P = VI (voltage times current). This can also be written as P = I^2R or P = V^2/R when you know the other quantities. The energy stored in a component is stored energy, not how fast energy is delivered. The amount of charge moved per second is current, not power. The total energy in the circuit is energy, not the rate of energy transfer. So the best description is the rate of doing work (energy transfer) per unit time.