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.
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 (based on 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.
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