Question

115. The equation of alternating current is
I = 42.4 sin 628 t. Then the average value
of current is ...
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Answer 1

Answer:

1. Max value is 42.42

2. Frequency is 628/(2*pi), so about 100 Hz

3. RMS value of a sine wave is amplitude/sqrt(2)

so in your problem it's 42.42/sqrt(2) = about 30.0

4. "Average value" in this context usually means

average absolute value, which is

(2/pi)*amplitude = about 27

5. Form factor is ratio of RMS value to average absolute value

= [1/sqrt(2)] / (2/pi) = about 1.11

This will be the same for any sine wave