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A laptop typically uses about 50 watts of electricity, the equivalent of 0.05 kWh. This means that if a laptop is on for eight hours a day, it will cost 5p a day to run the laptop (based on an average energy unit cost of 12.5 p/kWh).

A desktop PC typically uses around 100 watts of electricity, the equivalent of 0.1 kWh. This means that if a PC is on for eight hours a day, it will cost 10p a day to run the laptop (based on an average energy unit cost of 12.5 p/kWh).

170 watts = 0.17 kWh, on for 8 hours a day = **17p a day**

Energy is an inescapable expense for all businesses. But have you ever wondered how much each appliance is costing you? Saving electricity (and money) is always easier when you know how much you’re actually using. Although your appliances’ actual energy use depends on make and model (along with other factors like temperature conditions and the age of the appliance), these figures will give you an idea of how much it costs to run the appliances in your office.

Appliance | Watts |

Immersion heater | 3000W |

Oil-filled radiator | 1500-2500W |

Dishwasher | 1050-1500W |

Vacuum cleaner | 500-1200W |

Toaster | 800-1500W |

Kettle | 2200-3000W |

Microwave | 600-1500W |

Oven | 2000-2200W |

Dehumidifier | 300-700W |

Extractor fan | 5-36W |

Freezer | 150W |

Laptop | 20-50W |

Desktop computer | 80-150W |

Tablet (charge) | 10W |

Broadband router | 7-10W |

Smartphone (charge) | 2.5-5W |

Power rating in kW x hours used per day = kWh

kWh per day x unit cost = electricity cost per day

Take a 150-watt fridge and an energy unit cost of 12.5 p/kWh. The fridge runs 24 hours per day.

150W = 0.15kW

0.15 kW x 24 hours = 3.6 kWh

3.6 kWh x 12.5p = **45p per day **

Common appliances and their typical power ratings and cost *(b**ased o*n an average unit cost of 12.5p/kWh.)

1000 watts = 1kWh, on for 24 hours per day = **£3 per day = £1095 per year**

100 watts = 0.1 kWh, on for 8 hours per day = **10p per day**

50 watts = 0.05 kWh, on for 8 hours per day = **5p per day **

1 kWh per use = **12.5p for every ready meal**

0.11 kWh to heat 1 litre of water = **1.4p for 4 cuppas**

4000 watts = 4kWh, on for 8 hours a day =**£4 per day**

60 watt = 0.06kWh, on for 8 hours per day = **6p per day **

As a general rule, appliances which produce heat or have moving parts use more electricity than those that produce sound or light.

Every electrical appliance has a power rating which tells you the amount of electricity it needs to work. The power rating is generally given in watts (W) or kilowatts (kW). There are 1000 watts in one kilowatt. The amount of electricity each appliance uses is measured in time – kilowatt hours (kWh). UK energy suppliers measure energy consumption by kWh and charge a unit cost per kWh.

See the infographic below to find out…

**Download this infographic here.**

- Turn off appliances completely when not in use – don’t leave them in standby mode.
- Only boil the amount of water you need in the kettle.
- Switch to low energy light bulbs.
- If you’re buying a new appliance, look for one with an ‘A’ rating for energy efficiency
- Switch energy suppliers to avoid paying more than you need to.
- Switch from desktops to laptops.

**Sources:**

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