The sinusoidal AC in a circuit is I = 50 sin (20 t). The peak value of the current is:
Correct answer: C. 50 A
- A. 100 A
- B. 25 A
- C. 50 A
- D. 20 A
Explanation
The sinusoidal AC current given by the equation I = 50 sin(20t) has a peak value that is determined by the amplitude of the sine function. In this context, the peak value is the maximum value the current can reach, which is represented by the coefficient of the sine function, 50 A. Therefore, option C is correct.Option A is incorrect because 100 A is not the amplitude of the sine function. Option B is incorrect because 25 A is half of the amplitude, not the full peak value. Option D is incorrect because 20 A is the angular frequency's coefficient, not the peak current.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Phase of Alternating Current
Phase describes the position of an alternating voltage or current within its cycle and the phase difference between two sinusoidal quantities. The topic covers in phase signals, phase angle and lead or lag in resistive, inductive and capacitive circuits, rather than the amplitude or frequency of the supply.
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