You can calculate the amp draw by dividing the amount of wattage by the voltage. For example, a 1000-watt hair dryer running on 120 volts produces 10 amps of current draw. Ampacity, a term formed from the words ampere and capacity, is the maximum amount of electrical current a conductor or device can carry before sustaining immediate or progressive deterioration. You can use amp draw to determine whether the load on a circuit is safe. As a rule of thumb, do not load a circuit over 80 percent. You should limit the draw on a 20-amp circuit to 16 amps. Most household circuits have a 20-amp capacity, although some are only 15 amps.

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To calculate amp draw you will need to use a particular mathematical formula. You will need to use volts time amperes. It is equal to watts.

To calculate amperage draw in an electric circuit, you need to understand Ohm's law. Ohm's law states that V(volts)=I(current)xR(resistance). Rearranging for I, you have I=V/R. Derivatives of Ohm's law give you two other equations to calculate current, watts/volts, and Sqrt(watts/resistance).

To calculate amperage draw of an electrical device, you need to understand algebraic mathermatical computations. The calulations are a basic formula of Ohm's law and while challenging to understand, it is possible for you to calculate.

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