An increase of how many dB for voltage will result in a tenfold increase of the original dB value?

In the context of decibels (dB), it's important to understand how the dB scale relates to power and voltage. The decibel scale is logarithmic, meaning that a certain increase in dB translates to a multiplicative change in the corresponding quantity, either in power or voltage.

For power, an increase of 10 dB corresponds to a tenfold increase in power. However, when dealing with voltage, the relationship is different. Since power is proportional to the square of voltage (P ∝ V²), an increase in voltage must be calculated differently. Specifically, if we want to achieve a tenfold increase in power through voltage, we must increase the voltage by 20 dB.

This means that a voltage increase of 20 dB results in the power increasing by a factor of ten, which aligns with the requirement stated in the question. Thus, when we talk about an increase of 20 dB for voltage, it reflects a tenfold increase in the original power level, making it the correct answer.