So, how do we calculate the energy used for the electric fire or a light bulb or any other electrical device? This bit is important and worth going over a few times to understand what a kWh is. It’s 1 kW x 1 hour = 1 kilowatt hour, or 1 kWh. When you use the formula (Power x Time = Energy) you say 1 kW x 1 hour = 1 kilowatt Hour. And that’s how we get to the term Kilowatt Hour. That’s the same as saying a 1 kilowatt (kW) fire for 1 hour. Let’s say we use the 1000 Watt fire for 1 hour. In fact, this is how electricity supply is measured: Power x Time used = Energy. Now we can calculate how much energy is used. Electric fires with a thermostat which go “On” and “Off” as the reach they set temperature will be less expensive.
#POWER COST BASED ON SHOWER TIME CALC FULL#
It’s important to recognise that the cost calculation below is based on the fire being continually “On” for the full hour. Best estimates may be required in lots of cases. It’s only the “On” times that you need to know because that’s when it uses power. A fridge, for example, goes on and off as it works to keep the temperature constant. The longer you use it, the more power it uses, and the more it costs.įor some items you need to work out the time the item is actually on and using power. In this case we are using 1 hour to work out the cost.
Calculate the length of time the item is being used. Useful links: Low energy light bulbs Halogen Fires 2. Imagine the power difference between a 60W light bulb and a 1000W electric fire and we’ll see how costs of each compare later. For example, a 60W light bulb uses very little electricity compared to a 1kW electric fire, which is the same as saying a 1000W electric fire. There is a wide difference between what different items cost. In this case we are looking at a 1 kW electric fireįor information, note that 1 Kilowatt = 1000 Watts. First, look for the power rating of the electrical item in watts or kilowatts. (Note: It’s easier to use the calculator to work this out.) 1.
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