AC GENERATION ANALYSIS
Basic AC Theory
Figure 4 Effective Value of Current
Another useful value is the average value of the amplitude during the positive half of the cycle.
Equation (7-7) is the mathematical relationship between Iav , Imax , and I.
(7-7)
Iav
0.637 Imax
0.90 I
Equation (7-8) is the mathematical relationship between Eav , Emax , and E.
(7-8)
Eav
0.637 Emax
0.90 E
Example 1:
The peak value of voltage in an AC circuit is 200 V. What is the RMS value of
the voltage?
E = 0.707 Emax
E = 0.707 (200 V)
E = 141.4 V
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