If electricity is water, and that water is flowing through a pipe, then voltage is the width of the pipe and current (Amps) is the speed of the water flow (literally the current). Wattage, or power, is the overall volume of water (voltage multiplied by current).
So you could have a wide pipe (say 100V) with water flowing slowly (say 1A) through it, which would be 100W, or a much narrower pipe (12V) with water flowing so quickly through it (10A) that it actually provides more power overall (120W), all depending on the requirements of the device you’re powering.
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