Frequency means cycles per second. At 100 Hz, the waveform completes 100 cycles each second; in 2 s it completes 100×2 = 200 cycles.
Formula / Key Relation
Number of cycles N = f t
N = 100 × 2 = 200 cycles
T = 1/f = 0.01 s
Detailed Explanation
Concept & Reasoning
The hertz is defined as one cycle per second. Therefore the number of cycles occurring in any time interval is simply frequency multiplied by time. This is the direct inverse of the period relationship T = 1/f.
How to Solve It in the Exam
Hz × seconds = cycles.
Important Exam Point
Convert time to seconds before multiplying by frequency.
Related Revision Path
This question sits in the revision path Basic Electrical Engineering → AC Fundamentals → Frequency and Time .
Quick Trick
Hz × seconds = cycles.
Common Mistake
Do not divide frequency by time; divide only when finding frequency from a known number of cycles.
Exam Tip
Convert time to seconds before multiplying by frequency.
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