Question

The value of commercial unit of electrical energy in joules:

Answer 1

As we know that the commercial unit of electrical energy is kWh. It is defined as the energy consumed by an appliance of power 1kW in 60 minutes.
1000 W in 3600 s
So, we will calculate the value of 1 kWh in joules with the assistance of the equation $1kWh = 1kW \times 1h$

Complete step- by- step answer
At the very beginning we have to convert 1kWh into joule we all know that,
$1kWh = 1000W \times 1h$
$1kWh = 1000J{s^{ - 1}} \times 3600s$
$\Rightarrow 1kWh = 3.6 \times {10^6}J$

Hence, the value of commercial unit of energy in electrical energy in joules is $3.6 \times {10^6}J$ that is option A

Additional information: The electrical energy used in household appliances, industries and institutions is expressed in kWh and is expressed in units in monthly bills statements in our homes.one kilowatt of electrical energy is termed as one unit.

Note: One must keep in mind the proper depiction of 1 kW else one can land other answers. Also, proper care should be taken that one must not confuse it with the SI unit of energy that is joule.