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An ac voltmeter using full-wave rectification and having a sinusoidal input has ac sensitivity equal to
- a)1,414 times dc sensitivity
- b)dc sensitivity
- c)0.90 times dc sensitivity
- d)0.707 times dc sensitivity
Correct answer is option 'C'. Can you explain this answer?
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Explanation:
Full-wave rectification:
- Full-wave rectification doubles the number of times the input signal changes polarity, resulting in a smoother output compared to half-wave rectification.
AC sensitivity vs. DC sensitivity:
- AC sensitivity refers to the ability of the voltmeter to measure AC voltages accurately.
- DC sensitivity is the ability of the voltmeter to measure DC voltages accurately.
- In the case of a voltmeter using full-wave rectification, the AC sensitivity is typically around 0.9 times the DC sensitivity.
Relationship between AC and DC sensitivity:
- The AC sensitivity is lower than the DC sensitivity due to the nature of the AC signal, which changes polarity and magnitude continuously.
- The factor of 0.9 signifies that the AC sensitivity is 90% of the DC sensitivity.
Answer:
- Therefore, in this case, the AC sensitivity is 0.90 times the DC sensitivity, which is represented by option 'C'.
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An ac voltmeter using full-wave rectification and having a sinusoidal input has ac sensitivity equal toa)1,414 times dc sensitivityb)dc sensitivityc)0.90 times dc sensitivityd)0.707 times dc sensitivityCorrect answer is option 'C'. Can you explain this answer?
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