From my memory of a distant past Physics lesson, perhaps incorrectly. Watts are a function of Amps and Volts. Therefore, theoretically, for example, you could generate 100 watts with 2 Amps and 50 Volts. ( low current). You could also produce 100 watts with 50 amps and 2 Volts, ( high current)
The "best" analogy the Teacher could give is that current is the amount of electricity and voltage is the speed of it. ( The petrol/diesel analogy may not be a bad one)
Perhaps someone with some expert knowledge of electronics could explain how this relates to amplifiers.