A two-times increase in power results in a change of how many dB?

The decibel (dB) is a logarithmic unit used to express the ratio of two power levels. The formula for calculating a power ratio in decibels is 10 * log10(P2/P1). Because the base-10 logarithm of 2 is approximately 0.3, multiplying by 10 yields exactly 3 dB. Therefore, doubling the power always results in a 3 dB increase, and halving the power gives a 3 dB decrease. Distractors like 6 dB are incorrect for power, as 6 dB corresponds to a four-times increase in power (or a two-times increase in voltage).