At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is_____________?
Correct answer: B. -6.02 dB
- A. 6.02 dB
- B. -6.02 dB
- C. 12.04 dB
- D. -12.04 dB
Explanation
Voltage gain in decibels is 20 log10(Vout/Vin) = 20 log10(6/12) = 20 log10(0.5) = -6.02 dB. The negative sign shows that the filter attenuates the signal.
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