How do you calculate the total power in a three-phase AC system?
Correct Answer: P = √3 * V * I
- Step 1: Understand that a three-phase AC system has three wires carrying alternating current.
- Step 2: Know that in a balanced system, the current and voltage are equal in each phase.
- Step 3: Identify the line voltage (V), which is the voltage measured between any two of the three wires.
- Step 4: Identify the line current (I), which is the current flowing through each of the three wires.
- Step 5: Use the formula P = √3 * V * I to calculate the total power (P).
- Step 6: Multiply the line voltage (V) by the line current (I).
- Step 7: Multiply the result from Step 6 by √3 (approximately 1.732) to get the total power.
- Three-Phase Power Calculation – Understanding how to calculate total power in a balanced three-phase AC system using the formula P = √3 * V * I.
- Balanced vs. Unbalanced Systems – Recognizing the difference between balanced and unbalanced systems and how it affects power calculations.
- Line Voltage and Line Current – Knowing the definitions and roles of line voltage (V) and line current (I) in the power formula.
