Q:

# How many watts is 120 volts?

A:

Watts cannot be calculated using the number of volts alone. Amperage is required, too.

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To find how many watts are in 120 volts, one need to know the formula that relates power (P) in watts to volts (V) and current (I) given in amps. The formula for this relationship is that power equals volts multiplied by amps, or P = V x I.

So, if the question is how many watts are in 120 volts that delivers a current of 2 amps, then the answer is 240 watts using the formula.

Watts, amps, volts and ohms are the units utilized to measure electricity.

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## Related Questions

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At 115 volts of current, 115 watts is equal to one amp, but the number of watts to equal an amp varies based on the current. If using a 12-volt battery to power the circuit, 12 watts is equal to one amp.

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During the Megger test, an insulation resistance meter applies a direct current voltage of 500 or 1,000 volts to electrical insulation and records data at one minute, 10 minute and intermediate intervals to determine if the insulation is adequate for continued service. Megger test results show the relative amount of moisture in the electrical insulation, current leakage where the insulation is dirty or moist and any faults or deterioration in winding. Moisture decreases insulation resistance; low resistance indicates poor insulation.

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Using a multimeter, insert one of the probes from the multimeter into one of the parallel slots in the 240-volt outlet and insert the other probe into the other parallel slot to test if the outlet is indeed carrying 240 volts. If the voltage does not add up to 240 volts, check the slots individually to see which one is carrying less voltage.