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Many utility companies will bill you based on how many watts of energy you used. The power in watts is the rate at which energy is generated or used. Household wiring is usually 120 or 240 volts in North America. Larger appliances like ranges and clothes dryers require more power and are connected to circuits that are wired to 240 volt power and may draw 20 to 40 amps depending on a number of factors. However, most counter top household appliances are rated for 120 volts and operated with 12 or less amps. You can look up common figures for standard appliances (most small appliances and lighting fixtures in homes require circuits that range from 15-20 amps and larger ones are 20 to 60. You can also determine both volts and amps by looking on the labels or in the operating manuals. This is the maximum amperage that circuit can take before the circuit breaker trips. Circuit breakers usually have the amps written on their handles. This is why watts are sometimes called volt-amps.
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The formula is P=3A X 110V = 330 W (with P standing for power). For example, if the current is 3 amps (3A) and the voltage is 110V, you multiply 3 by 110, to get 330W (watts).Sometimes you will see this formula written as W=A X V. That's it! In other words, watt=amp X volt. The number of watts is equal to amps multiplied by volts.Voltage measures the force or pressure of the electricity. The ampere (or amps) is the amount of electricity used.
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To determine the wattage, use a simple multiplication formula. You will need to know the amps and the volts in the power source.