Power is defined as what in electrical terms?

Power is defined as what in electrical terms?

• A. Total energy stored
• B. Current times resistance
• C. Voltage
• D. Rate of energy change over time

Answer: (D)

Power in electrical terms is the rate at which electrical energy is transferred or converted per unit time. That means it measures how quickly a device uses or delivers energy, and its unit is the watt (one joule per second). For example, a lamp rated at 60 watts uses 60 joules of electrical energy every second when it’s on. This idea aligns with the common formulas P = IV, P = I^2R, or P = V^2/R, depending on what quantities you know. The other options describe energy stored (not how fast energy is used), voltage (the potential difference, not the rate of energy transfer), or a relation that doesn’t itself define power. The rate of energy change over time is the correct concept.

Power in electrical terms is the rate at which electrical energy is transferred or converted per unit time. That means it measures how quickly a device uses or delivers energy, and its unit is the watt (one joule per second). For example, a lamp rated at 60 watts uses 60 joules of electrical energy every second when it’s on. This idea aligns with the common formulas P = IV, P = I^2R, or P = V^2/R, depending on what quantities you know. The other options describe energy stored (not how fast energy is used), voltage (the potential difference, not the rate of energy transfer), or a relation that doesn’t itself define power. The rate of energy change over time is the correct concept.