1.

The line that draws power supply to your house from street has

Answer»

ZERO average current.
220 V average voltage.
voltage and current out of PHASE by `90^@`
voltage and current possibly differing in phase `phi`such that `|phi| lt pi/2`

Solution :For household supplies, AC CURRENTS are used which are having zero average value over a cycle.
The line (cable) is having some resistance so power factor,
cos `phi=R/Z ne 0`
Hence, `phi ne pi/2`
`therefore phi lt pi/2`
Means, phase difference lies between 0 and `pi/2`


Discussion

No Comment Found

Related InterviewSolutions