what is commercial unit and with it's important derivation
Answers
Answer:
The commercial unit of electrical energy is a kilowatt-hour (kWh).
To convert 1kWh into joule
1kWh = 1000 × 60 × 60
1kWh = 3.6 × 106 J
The electric energy used in factories, industries and houses which are measured in kWh
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
step by step answer :
Important derivation:
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:
⇒1A×240V×24hrs×60minhr×60smin=20736000J⇒1A×240V×24hrs×60minhr×60smin=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
⇒1KWh=1kWh×1000WkW×60minhr×60smin=3.6106J⇒1KWh=1kWh×1000WkW×60minhr×60smin=3.6106J
Hence,
⇒1KWh=3.6106J⇒1KWh=3.6106J
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.
I hope it may help you
Answer:
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