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 » Science Measurements

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 » Science Measurements

Watts cannot be calculated using the number of volts alone. Amperage is required, too. More » Home & Garden Home Maintenance Electrical
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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 » Science Measurements

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 » Science Measurements

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 » Science Measurements

Because these two terms measure two different aspects of electricity, it is not possible to convert between the two. Amperage is a measure of current flow past a given point, while voltage is the potential for current fl... More » Science Measurements