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An alternating electric current has a frequency of $50 Hz$ . How many times does it change its direction in $1$ second?

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20

40

80

100

answer is D.

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Detailed Solution

An alternating electric current has a frequency of

50 Hz

. Its direction changes by

100 times

.
Frequency is the number of cycles per second. Here, an alternating current is given. So, we can easily say it is completing

50 cycles

one second

. One cycle is said to be a combination of positive and negative half cycles. Here, in

50

cycles, there will be

50

positive and

50

negative half cycles i. e;

100 times

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