Volts and watts are used for electric circuits to quantify the power source. You can derive the value of watt and volts from the value of each other.
Volts can be simply defined as the measurement of potential difference while, on the other hand, watts can be defined as the measurement of power. When calculating the values of voltage, it is a lot easier than wattage.
Most of the electrical device around us do not show how many watts are provided, but they do show the values of voltage in volts and the current in amps, but you can get the wattage by multiplying the voltage with the maximum current the power source can also deliver wattage can be seen on the device like air conditionals, refrigerators and so on.