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Alternating Current and Voltage - Engineering

Q1:

If a sine wave goes through 10 cycles in 20 s, the period is

A 20 s

B 4 s

C 2 s

D 100 s

ANS:C - 2 s

Frequency is a number of cycles per second.

f = frequency, T = time period, f = 1/T

In case of period - time per cycle. So, t/cycles (just reverse)

20/10 = 2 micro second.