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The diagram below illustrates an a.c.source of 50V(r.m.s.), \(\frac{100}{\pi}\)Hz...

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Question 626
A
1.33
B
1.25
C
0.80
D
0.75
E
0.60
Explanation
cos\(\theta = \frac{R}{Z}\)

R = \(\frac{V}{I} = \frac{40}{2} = 20\)

Z = R2 + \(^X_L\) = 202 + 152 = 300

cos \(\theta = \frac{R}{Z} = \frac{20}{300} = 0.06\)

Correct option: E

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