Engineering Board Exam Reviewer · Alternating Current and Voltage · hard
A sinusoidal voltage has an rms value of 120 V. At what angle in the first quadrant of the cycle does its instantaneous value equal 100 V?
- 56.4°
- 72.2°
- 36.1°
- 18.1°
Answer
C. 36.1°
Solution
Vp=120 2=169.7 V. =100/169.7 =36.1°.
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