Engineering Board Exam Reviewer · Alternating Current and Voltage · hard
The rectangular pulse train shown has a period of 10 ms and is at 20 V for the first 4 ms of each period and zero for the rest. Find its rms value.
- 8 V
- 14.1 V
- 8.94 V
- 12.6 V
Answer
D. 12.6 V
Solution
The duty cycle is D=4/10=0.4. Vrms=sqrt(1/T v2dt)=Vpsqrt(D)=20sqrt(0.4)=12.6 V.
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