Which one of the following alternating current is supplied in our house hold circuits?
(1) 110 V and 50 Hz
(2) 220 V and 60 Hz
(3) 110 V and 60 Hz
(4) 220 V and 50 Hz
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(4) 220 V and 50 Hz
AC supply in India is at 220 V and 50 Hz.