In a three-phase AC supply, the P.D across two live wires is
Correct answer: C. √3V
- A. √2V
- B. √5 V
- C. √3V
- D. √7V
Explanation
In a three-phase AC supply, the phase voltage (V) is the voltage between any one of the live wires and the neutral wire. The line voltage (P.D across two live wires) is √3 times the phase voltage. Therefore, the correct option is √3V
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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