How do we get different power outputs (watts) with same voltage?
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To complete the set of equations from previous replies, the following objectively untrue equation is used daily worldwide because it’s so close to reality for industry (when we aren’t doing physics equations for fun):
V=IR, Voltage equals current multiplied by resistance. Taken together with P=VI: make devices that increase/decrease the voltage at different parts of the circuit (we don’t get to pick the starting voltage, that’s set by the circuit in the wall), and/or the resistance of the device you plug into the wall.
So, as a consequence of these equations, since we control resistance and voltage, we also control current and power.
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