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And yet, power just means energy flow per unit time. We all know the Watt is a unit of power consumption and have an idea how quickly a 1500 Watt kettle boils water. The unit of energy is the Joule - a Watt is just a flow of one Joule per second. The other popular unit of power is the horsepower. The conversion is that one horsepower = 756 Watts. A 100-HP car would be able to turn a 75,600 - Watt electrical generator, or 75.6 kilowatts. So anybody who does talk about energy, rarely speaks in Joules.
The most popular unit of measurement used by electricity meter is kilowatt hour. One kilowatt hour is equal to the quantity of power used by one kilowatt of load during a time period of one hour or 3,600,000 joules.Some of the power supplying companies use SI (International System) mega joule as units of measurements in electric meter.he Volt-amperes are the measurement units electric meter use to measures the amount of the entire power moved through a distribution network, including reactive and actual. This is equal to the product of root-mean-square volts and amperes.