Question
Which decibel value represents a power increase from 20 watts to 200 watts?
Answer Options
- A) 10 dB
- B) 12 dB
- C) 18 dB
- D) 28 dB
Correct Answer: A
Explanation
This problem involves the power ratio of 10:1. The second key decibel relationship to memorize is that a 10\text{ dB} increase represents a tenfold increase in power. Conversely, a -10\text{ dB} decrease represents a one-tenth reduction in power.
Since the power is increasing from 20\text{ watts} to 200\text{ watts}, this is a multiplication factor of 200 / 20 = 10. Therefore, the power increase is exactly 10\text{ dB}. This conversion is important for measuring amplifier gain or signal strength (T5B10).
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!