The output voltage is the difference in potential between an audio amplifier's two output terminals. This voltage is usually measured in volts (V) and corresponds to the signal's strength after it has been amplified. The output voltage of an audio amplifier is usually much higher than the input voltage. This allows the amplifier to increase the signal's power. The output voltage of an audio amplifier is determined by the type of amplifier, the gain, and the load resistance. The gain of an amplifier is defined as the ratio of the voltage coming out to the voltage going in. For example, if an amplifier has a gain of 10, it will output 10 volts for every volt applied to the input terminal. The load resistance is the resistance of the thing connected to the amplifier's output. The amount of current that flows through the amplifier is determined by the amount of resistance. Several factors, including the input signal, gain, and load resistance, can affect the voltage output of an audio amplifier. To get the best sound out of an amplifier, you must understand how these variables affect the output voltage.