Get ready for the NCEA Level 1 Energy Test. Utilize flashcards and multiple choice questions with clear explanations and hints. Prepare for success!

Multiple Choice

In electrical notation, P stands for which quantity?

Power is the rate at which electrical energy is transferred or used in a circuit, and P is the symbol for that quantity. In circuits, power equals voltage times current: P = V × I. This shows how much energy per second is being delivered to or consumed by a component. If you know the resistance, you can also use P = I²R or P = V²/R, depending on which quantities you know. The unit is the watt (W), one joule per second. For example, at 12 volts with a current of 2 amperes, the power is P = 12 × 2 = 24 W. Voltage is V, current is I, and resistance is R.

Power is the rate at which electrical energy is transferred or used in a circuit, and P is the symbol for that quantity. In circuits, power equals voltage times current: P = V × I. This shows how much energy per second is being delivered to or consumed by a component. If you know the resistance, you can also use P = I²R or P = V²/R, depending on which quantities you know. The unit is the watt (W), one joule per second. For example, at 12 volts with a current of 2 amperes, the power is P = 12 × 2 = 24 W. Voltage is V, current is I, and resistance is R.