A signal increase of 1 dB represents what approximate increase in power?

A signal increase of 1 decibel (dB) is a logarithmic measure and corresponds to a specific increase in power. The formula used to convert dB to power is given by the expression:

[ P_{\text{increase}} = 10^{\left(\frac{\Delta dB}{10}\right)} ]

In the case of a 1 dB increase:

[ P_{\text{increase}} = 10^{\left(\frac{1}{10}\right)} ]

Calculating this gives:

[ P_{\text{increase}} \approx 1.2589 ]

This means that a 1 dB increase in power corresponds to approximately a 25.89% increase in the original power level. Thus, the correct choice accurately represents the mathematical relationship between decibels and power, confirming that a 1 dB increase is approximately a 25.89% increase in power.