1)Why is there phase difference between voltage and current inan a.c. circuit ?. Explain the concept of power factor.
2). Discuss the disadvantages of a low power factor.
3. Explain the causes of low power factor of the supplysystem.
4. Discuss the various methods for power factor improvement
5)Write short notes on the following : (i) Power factorimprovement by synchronous condenser (ii) Importance of p.f.improvement (iii) Economics of p.f. improvement
