Power in watts equals amperes times voltage. So, in a direct current, 1 amp at 110 volts equals 110 watts, whereas 1 amp at 220 volts equals 220 watts. More »

The question of how many watts equal 1 horsepower depends on how you define horsepower. One mechanical horsepower unit is approximately equal to 745.7 watts. One electrical horsepower, used for rating electrical motors, ... More »

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

In general, watts are calculated by taking the current, in amps, and multiplying by the voltage. AC currents involve additional steps, which may include multiplying by a power factor (for single-phase currents) or multip... More »

To calculate watts to voltage, different formulas, such as Power = I x V and Power = V squared / R, are used. These different physics formulas are then manipulated so that voltage is expressed in terms of certain other v... More »

Amps do not contain any volts. Volts and amps are two different types of electrical properties, and one does not contain the other. A relationship does exist between volts and amps, and Ohm's Law defines that relationshi... More »

The only difference between an amp and a milliamp is that an amp is 1,000 times larger than a milliamp. Both amps and milliamps are metric units used by scientists to measure electrical current, although at different sca... More »