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# What is the commercial unit of energy? Convert into Joules. What is the other name of these commercial units?

Last updated date: 20th Jun 2024
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Hint A kilowatt is equal to a thousand watt of power. Commercial units of energy are those which are used in industrial functions or consumption calculations. Joule is a standard unit and it is also an SI unit of energy.

In our everyday life, the usage of energy is enormous. In addition, the Joule is quite a small unit of energy. In electrical terms, it is defined as the energy used when 1 ampere of current flows through a load for one second when a potential difference of 1 volt is applied across it.
Now let us investigate the energy usage in joules. The potential difference of electricity supplied into our homes is 240 V and 120 V depending on the country. Assuming a one ampere current is flowing through a home appliance connected for a day, the energy consumed by it is calculated as:
$\Rightarrow {\text{1A}} \times {\text{240V}} \times {\text{24hrs}} \times {\text{60}}\dfrac{{{\text{min}}}}{{hr}} \times 60\dfrac{s}{{\min }} = 20736000J$ . We see the enormous amount of energy consumed by this device in joules.
However, writing such units in commercial activities can look daunting, and in fact exhausting to write. Hence, a need for a much larger unit. The kilowatt hour is the unit employed for this purpose.
Converting 1 kWh to Joule is given as
$\Rightarrow 1KWh = 1kWh \times 1000\dfrac{W}{{kW}} \times 60\dfrac{{\min }}{{hr}} \times 60\dfrac{s}{{\min }} = {3.610^6}{\text{J}}$
Hence,
$\Rightarrow 1KWh = {3.610^6}{\text{J}}$
Another unit identical to the kWh is the kVAh (kiloVolts-Ampere-hour).
Hence, another name for kWh is the kVAh.

Note
In application, however, while the kilowatt hour is used for the exact (real) energy consumed by a device, the kilovolt ampere hour is used to calculate the total apparent energy consumed by the entire process. This includes energy lost in reactive elements.