Which symbol is commonly used to denote electrical power?

Which symbol is commonly used to denote electrical power?

• A. P
• B. I
• C. V
• D. R

Answer: (A)

In electrical circuits, power is the rate at which electrical energy is transferred or used. The symbol used to denote this quantity is P, which you’ll see in formulas like P = VI for direct current, where V is voltage and I is current. This shows power as the product of voltage and current. You can also express the same quantity as P = I^2R or P = V^2/R, depending on which variables you know. That flexibility reinforces why P is the standard symbol for power. The other symbols stand for different quantities: I represents current, V represents voltage, and R represents resistance. Power is a separate concept, and its unit is the watt (W). For example, with 120 V and 2 A, the power is 240 W. So the symbol commonly used to denote electrical power is P.

In electrical circuits, power is the rate at which electrical energy is transferred or used. The symbol used to denote this quantity is P, which you’ll see in formulas like P = VI for direct current, where V is voltage and I is current. This shows power as the product of voltage and current. You can also express the same quantity as P = I^2R or P = V^2/R, depending on which variables you know. That flexibility reinforces why P is the standard symbol for power.

The other symbols stand for different quantities: I represents current, V represents voltage, and R represents resistance. Power is a separate concept, and its unit is the watt (W). For example, with 120 V and 2 A, the power is 240 W.

So the symbol commonly used to denote electrical power is P.