Question

What is the value of 1KWh in terms of Joule?

Answer 1

Hint: Kilowatt-hour is a unit for energy. It is the amount of power given to a system for one hour. Joule is the SI unit of energy and watt is the SI unit of power. Usually, the watt is represented as the amount of work done in joules per time in seconds.

Complete answer:
Kilo-watt hour is a unit of energy used to denote the energy consumption of large machinery and the electricity consumption in homes and industries. It is also a common unit representation in electrical power engineering.
One kilowatt means 1000 watts of power and 1 hour contains 3600 seconds in it. So, if we try to express one kilo-watt hour is terms of joules we get,
$1\text{KWh}=\left( 1000W \right)\times \left( 3600s \right)=3.6\times {{10}^{6}}\text{ Joules}$
So, one 1KWh contains $3.6\times {{10}^{6}}\text{ Joules}$.

Note:
Electrical energy is usually sold to consumers in kilowatt-hours. The cost of running an electrical device is calculated by multiplying the device's power consumption in kilowatts by the operating time in hours, and by the price per kilowatt-hour. The unit price charged for power consumption is determined by the electricity board of each state in India.
$\text{Energy Consumption}=\text{Power Consumption(in KWH)}\times \text{Number of Hours of Usage}$
$\text{Electricity Cost}=\text{Energy Consumption}\times \text{Cost of unit usage}\text{.}$