How do you know which elettronic appliances impacts more heavily on your elettricity bill? For example a pc, airfryer, rice cooker, air con.
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For anything which plugs into the wall you can buy a fairly cheap Kilowatt Meter that you plug in first then plug the thing into it, to measure how much power the thing is actually using. They often let you put in the price for a unit of electricity, and then show you an estimate of cost while the thing is powered on.
Other people are suggesting looking at the device’s rating in Watts which is useful to get an idea, but that rating tells you the maximum power the thing could draw; most of the time it will be using less. e.g. I measured a 2,000 Watt induction hob cooker, and it uses below 200W keeping a saucepan of potatoes boiling. What impacts your bill depends on the settings you use things at, how long you use them each time, and how often you use them. Best way to find out: measure things.
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