Ncert Exercises & Solutions

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

(a) zero average current
(b) 220 V average voltage
(c) voltage and current out of phase by $90 °$
(d) voltage and current possibly differing in phase $ϕ such that |ϕ| < \frac{π}{2}$

1. (b, c)

2. (a, d)

3. (b, d)

4. (a, c)

(a, d) Hint: AC currents are used in domestic supplies.

For household supplies, AC currents are used which are having zero average value over a cycle.

The line is having some resistance so the power factor,

\cos ϕ = \frac{R}{Z} \neq 0

So, ϕ \neq π / 2 \Rightarrow ϕ < π / 2

i . e ., phase lies between 0 and π / 2 .

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