Class 4 (4th Engineer) MET 📅 Mar 2024

Exam Question

(a) Explain power factor with a.c. Sine wave and phasor diagram. (6)

(b) A circuit has a resistance of 25Ω and an inductance value of 0.3H. If it is connected to a 230V, 50Hz supply, find the curcuit current, the power factor and the power dissipation (10)

Reference Answer

### (a) Explanation of Power Factor
**1. Definition**
Power Factor (PF) is the ratio of True Power (P), which performs useful work, to the Apparent Power (S), which is the total power supplied to the circuit. It is a measure of how effectively the supplied current is being converted into useful work.
Mathematically, it is expressed as:

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