What does the power triangle express in electrical terms?

• A. P = IV
• B. P = I + V
• C. P = V + R
• D. P = R/I

Answer: (A)

The power triangle in electrical terms expresses the relationship between real power (P), current (I), and voltage (V) through the formula P = IV. In this context, real power (measured in watts) is the product of current (in amperes) flowing through an electrical circuit and the voltage (in volts) across that circuit.

The significance of this relationship lies in its ability to illustrate how much electrical energy is being converted into useful work. In alternating current (AC) systems, the power triangle also integrates reactive power and apparent power, represented by the phase difference between the current and voltage. However, at its core, the power triangle relies heavily on the foundational equation P = IV, which is valid for both DC and AC forms of electricity.

The other choices do not accurately reflect the primary formula that defines the power triangle, which is strictly concerned with the interaction between power, current, and voltage.