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If we only used joules as our measure then the numbers on the bills would be very large. A typical bill may have a 3 month usage of 150kWh. This would be 540000kJ. kWh keeps the numbers small and manageable without the need for a calculator to do the sums. If your bill said you had used 150kWh at 10p per kWh you can quickly see that this is £15 worth of electricity. If it said you had used 540000kJ at 1p per 360kJ then it gets harder to do the mental arithmetic

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There is no special unit of measurement for electricalenergy. All energy, including work and heat, share exactly the same units. And there are many more units for energy than just two, depending on which system of measurements you choose to use: the SI System, the cgsA System, or the Imperial System for example. So energy could be measured in joules, watt hours, calories, British Thermal Units, and so on.

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Q: Why are there two units for electrical energy?
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