Two transmitters are each operating with a transmit power level of 100 mW. When you compare the two absolute power levels, what is the difference in dB?
- 0 dB
- 20 dB
- 100 dB
- You can’t compare power levels in dB.
Explanation: When the two power levels are the same, the result is 0 dB. As long as you remember the first handy 0 dB fact, you will find exam questions like this easy. If not, you will need to remember that dB = 10log 10 (100 mW / 100 mW) = 10log 10 (1) = 0 dB.
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