Which quantity is represented by the letter P?

Which quantity is represented by the letter P?

• A. Voltage
• B. Current
• C. Resistance
• D. Power

Answer: (D)

Power is the rate at which electrical energy is delivered or consumed in a circuit. The letter P is the standard symbol for this quantity. In DC circuits, power equals voltage times current, P = V × I, so it tells you how much energy per second is being used. Power is measured in watts (W). You can also relate it to resistance with P = I^2 R or P = V^2 / R, showing that power is a rate, not just a single voltage, current, or resistance value. Voltage is represented by V, current by I, and resistance by R, so P specifically denotes power.

Power is the rate at which electrical energy is delivered or consumed in a circuit. The letter P is the standard symbol for this quantity. In DC circuits, power equals voltage times current, P = V × I, so it tells you how much energy per second is being used. Power is measured in watts (W). You can also relate it to resistance with P = I^2 R or P = V^2 / R, showing that power is a rate, not just a single voltage, current, or resistance value. Voltage is represented by V, current by I, and resistance by R, so P specifically denotes power.