70 INPUT "ENTER PERIODIC TIME IN MICROSECONDS" : US
80 LET T=US/(10-6)
90 LET F=l/T
100 PRINT "FREQUENCY = " F "HERTZ"
Example 12 Twenty cycles of a voltage sine wave occur in 100 ms.
Calculate the frequency.
100
Periodic time of 1 cycle = = 5 ms
3
20
1 5 1000
/ = - = i + = = 200 Hz
3
t 1000 5
(See program 61, above.)
Alternative method.
100
20 cycles occur in 100 ms = —- = 0.1 s
3
10
3
1
In 1 s number of cycles = — x 20 = 200 Hz
3
0.1
Example 13 A two-pole a.c. generator is running at 300 rev/min.
Calculate the frequency of the voltage generated and the periodic
time.
300
300 rev/min = = 5 rev/s = 5 Hz
60
1 1 1 x 1000
/
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