How many times does the polarity of an A.C. supply of frequency 50 Hz change in one second ? |
|||||||
(a) |
50 |
(b) |
100 |
(c) |
|
(d) |
200 |
How many times does the polarity of an A.C. supply of frequency 50 Hz change in one second ? |
|||||||
(a) |
50 |
(b) |
100 |
(c) |
|
(d) |
200 |