How do you calculate the energy consumption of an electrical appliance?

To calculate the energy consumption of an electrical appliance, you need to know its power rating and the time it is used for.

The energy consumption of an electrical appliance is measured in kilowatt-hours (kWh). To calculate this, you need to know the power rating of the appliance in watts (W) and the time it is used for in hours (h). You can find the power rating of an appliance on its label or in the user manual.

To calculate the energy consumption, you need to multiply the power rating by the time it is used for and then divide by 1000 to convert from watts to kilowatts. For example, if a 1000 W kettle is used for 1 hour, the energy consumption would be:

Energy consumption = (power rating x time used) / 1000
Energy consumption = (1000 W x 1 h) / 1000
Energy consumption = 1 kWh

You can also use this formula to estimate the cost of running an appliance by multiplying the energy consumption by the cost per kWh from your electricity supplier.

It's important to note that some appliances have different power ratings depending on their settings or modes of operation. For example, a laptop may use less power when in sleep mode than when it is fully operational. In these cases, you will need to take this into account when calculating the energy consumption.