Watts = Amps x Voltage x Power Factor
Hence to compute watts you need to know voltage and power factor. If you have a pure resistive load like a light bulb power factor = 1 and can thus be ignored. If you are asking about residential power, the voltage is 120 VAC so the computation is now trivial.
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One ampere is equal to one watt in a system with a voltage of one volt. This relationship stems from Ohm's Law (P = V x I), where power (P) in watts is equal to voltage (V) in volts multiplied by current (I) in amperes.
One ampere is equal to one watt in a system with a voltage of one volt. This relationship is defined by Ohm's Law, which states that power (in watts) is equal to current (in amperes) multiplied by voltage (in volts).
One horsepower is approximately equal to 745.7 watts.
There are 1,000 terawatts in one gigawatt. This is because one terawatt is equal to one trillion watts, and one gigawatt is equal to one billion watts.
One quadrillion watts is equal to one million gigawatts.
The relationship between watts and amperes depends on the voltage. For a direct current (DC) circuit, the formula is Watts = Amperes x Volts. So, for a circuit with 1 ampere at 1 volt, the power would be 1 watt.