One volt is zero watts.
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Power (in watts) is calculated by multiplying voltage (in volts) by current (in amperes). So the power of 1 volt would need additional information about the current flowing through the circuit to determine the wattage.
Five amps is 600 watts on 120 v and 1200 watts on 240 v.
As watts equals volts times amps (ohms law simplified) you are missing part of the equation.. Let's say you are asking about how many watts is 1 amps at 12v then... If W = V x A then 1A at 12v = 12 watts
100v at 1A is 100 watts, 240 v 5A is 1200 watts. The other numbers give intermediate amounts of watts.
A 1-HP motor is reckoned to draw 7 amps at 240 v single-phase. The same power of motor would draw 3.5 amps at 480 v single-phase, but a 480 v supply could most likely be a three-phase suppy, and the current in that case would be reckoned as 2 amps.
To calculate the power (in watts), use the formula P = V x I, where P is power, V is voltage, and I is current. In this case, P = 230V x 1.30A, which equals 299 watts.