Exam-style question
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Define alternating current and explain its characteristics in terms of period, frequency, and peak value.
Model answer
What a good answer should say
- Alternating current (AC) is an electric current that periodically reverses direction.
- The period is the time taken for one complete cycle of the waveform, while frequency is the number of cycles per second, measured in hertz (Hz).
- The peak value is the maximum voltage or current reached in one cycle.
Explanation
Why this works
This answer effectively defines alternating current and describes its key characteristics, testing the student's understanding of fundamental AC concepts. It requires recall and comprehension of the definitions and relationships between period, frequency, and peak value.
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