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 \(90^\circ\)
(d) voltage and current possibly differing in phase \(\phi\) such that \(|\phi|<\dfrac \pi 2\)


Choose the correct options:

1. (b), (c)

2. (a), (d)

3. (b), (d)

4. (a), (c)

Subtopic:  AC vs DC |
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