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The line that draws the power supply to your house from the street has:
(a) zero average current
(b) \(220~\text V\)  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 |
Level 3: 35%-60%
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