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Knowledgebase: General Electrical Terminology
The Power Equation & Maximum Load
Posted by Mark Mortimer on 18 January 2012 10:03 PM

The Power Equation states the relationship between volts, amps, and watts. It can be presented in three ways:

Volts x Amps = Watts
Watts ÷ Amps = Volts
Watts ÷ Volts = Amps

Example: A lightbulb running at 120 volts and drawing 1
amp is using energy at the rate of 120 watts.

The current (Amps) is given by dividing the power rating of the appliance connected by the voltage thus for a 250 volt supply a three kilowatt appliance will draw 12 amps.

The maximum load rating on a socket or power strip is often stated at say 2400watts. This is calculated by taking the voltage (240v) and multpying it the Amp rating of the fuse (10amps). The higher the fuse rating the higher the maximum load on the socket, power strip, or circuit. Above these levels the fuse will give or the socket burn out.

In the USA the maximum load levels are lower because the voltage is lower at 110v.

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