In which of the following equipment direct current is needed ?
A. Telephones
B. Relays
C. Time switches
D. All of the above
Show Answer
Answer: D
Share your understanding of this question with the correct explanation.
In which of the following equipment direct current is needed ?
A. Telephones
B. Relays
C. Time switches
D. All of the above
Answer: D
Share your understanding of this question with the correct explanation.