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The frequency of AC in some countries is 60 Hz. What does this mean?
A. The current changes direction 60 times in a second.
B. The current changes direction 120 times in a second.
C. The current changes direction after every 60 seconds.
D. The current changes direction after every 120 seconds
Answer.
- The frequency of an AC signal is the number of cycles per second in an AC sine wave. Here, there are 60 cycles per second .
- In each cycle , the current changes direction twice :
-
- Positive to negative
- Negative to positive
Therefore, in a signal of frequency 60Hz, the current would change direction 120 times in a second .
The correct answer is B .
