Engineering Board Exam Reviewer · Alternating Current and Voltage · hard
The voltage shown is a sine wave riding on a dc level (it swings between -10 V and +30 V). Find its rms value.
- 24.1 V
- 21.2 V
- 17.3 V
- 14.1 V
Answer
C. 17.3 V
Solution
The dc level is 10 V and the sine has peak 20 V. Vrms= Vdc2+≤ft(Vm/ 2 )2=sqrt(102+14.142)=17.3 V.
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