Voltage alone cannot be used to determine Watts. There is also a need for amps.
Knowing the formula that links power (P), measured in watts, to volts (V), and current (I), measured in amps, is necessary to determine how many watts are present in 120 volts. The equation for this relationship is P = V x I, or power equals volts times amps.
So, using the formula, the answer to the question “How many watts are in 120 volts that delivers a current of 2 amps” is 240 watts.
The units used to measure electricity are watts, amps, volts, and ohms.
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