In times when energy prices are rising and energy is to be saved for environmental protection, everyday electricity consumption is an important cost factor. Electricity consumption is billed by electricity providers in kilowatt hours. But what is behind the measurement unit kilowatt hour (kWh) and what can be done with one kWh?

Our households are full of devices that require one thing above all – electricity. In other words, energy that is billed in kilowatt hours (kWh). Whether it’s a washing machine, dishwasher or smartphone, we plug the devices into the socket and the electricity meter bills for consumption. Nevertheless, the energy consumption of the individual devices remains an abstract quantity. That’s why it’s worth taking a closer look at the measured value of kilowatt hours to be able to estimate your own energy consumption and save money.

## Overview

## How to calculate a kilowatt hour?

Electricity consumption is expressed in kilowatts (kW), which is the power of an electrical device. 1000 watts are 1 kilowatt (kW). If you now add the time period in which energy is consumed or generated in a certain power, you calculate the so-called kilowatt hour (kWh). For example, a 100-watt light bulb that burns for ten hours consumes exactly one kilowatt hour (kWh) of energy. This makes it possible to calculate how much an appliance consumes within an hour, or even how much “work” it has done in a period of time.

One kWh can brew a good 70 cups of coffee or prepare a meal for four people on an electric stove. Playing with the Playstation is possible for a good five hours with one kilowatt hour, or swinging the steam iron for half an hour.

## Calculating the consumption of electronic devices

The consumption of energy is calculated in kilowatt hours. However, the actual consumption of devices is also often given in watts. From the data in watts, you can calculate the consumption in kilowatt-hours. The power of the device (watts) is multiplied by the time (hours), which gives the power consumption in watt-hours (Wh). The number of watt-hours can now be divided by 1000 to calculate kilowatt-hours (kWh).

## Average consumption of a 2-person household

To better estimate the annual electricity consumption, it is worthwhile to use the average annual consumption values as a comparative figure. According to Statista, the annual consumption of a 2-person household in Germany in 2021 in a multi-family house was 2800 kilowatt hours with electric water heating and about 2000 kilowatt hours without electric water heating. For 2 persons in single-family houses, the annual consumption with own electric water heating was 3500 kilowatt hours, which is much higher. Without electric water heating, single-family households with two persons consumed about 3000 kilowatt-hours per year.

In contrast, a 4-person household in a single-family house consumed between 5000 kWh (with hot water) and 4000 kWh (without hot water), while in a multi-family house consumption ranged from 4100 to 2600 kWh, depending on hot water preparation.

If one lies far over this average consumption of the indicating 2 to 4 person households, one can begin with six Tipps of atechbook with the current saving in the household .

## So much you can do with 1 kWh of electricity

In addition, the following simple examples can be used to illustrate how much you can do with one kilowatt-hour of electricity to reduce power-hungry activities.

With one kWh of electricity, you can do….

- almost two hours of vacuuming with a 600-watt vacuum cleaner.

- wash around 200 pieces of crockery and cutlery in the dishwasher.

- wash about eleven kilograms of laundry in an eco program at 40 to 60 degrees.

- bake a cake.

- toast about 130 slices of bread.

- shave about 2000 times.

- style your hair for one hour with a 1000-watt hairdryer.

- about 111 hours of light from a nine-watt LED lamp.

- watch around twelve hours of television with an LED TV with a screen diagonal of 140 centimeters.