What does P equal?

What does P equal?

• A. Voltage times resistance
• B. Current times voltage
• C. Voltage divided by current
• D. Resistance times current

Answer: (B)

Power in an electrical circuit is the rate at which energy is delivered, measured in watts. The basic relationship is P = VI, so power equals voltage times current. That makes the correct choice consistent with the standard formula for electrical power. You can also derive alternative forms using Ohm’s law V = IR: P = VI becomes P = I^2R or P = V^2/R. The other options don’t yield power in general—V×R isn’t power, V/I equals resistance, and IR is not power by itself (it’s a component of the power equations, not the power value).

Power in an electrical circuit is the rate at which energy is delivered, measured in watts. The basic relationship is P = VI, so power equals voltage times current. That makes the correct choice consistent with the standard formula for electrical power. You can also derive alternative forms using Ohm’s law V = IR: P = VI becomes P = I^2R or P = V^2/R. The other options don’t yield power in general—V×R isn’t power, V/I equals resistance, and IR is not power by itself (it’s a component of the power equations, not the power value).