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Going back to our electric heater that consumed 12 amperes when turned to maximum heat production. How much power does the heater use in this case?
One night you go to bed at 22.30h and you forget to turn off your heater. It’s been using 8A the entire night and you only notice this at 7.30h, which is when you turn the heater off immediately. ‘So much energy wasted’, you think. But how much energy did the heater consume overnight?
You are very attached to your heater so when you go on a winter holiday to the USA you take your heater with you. You even bought an adapter so that it will fit in the USA wall sockets. When you arrive in your hotel and plug in the heater, you find that it doesn’t get nearly as hot as you are used to. You check the settings and it is on max (so 19.7 Ohm), yet the current is only 6A. What’s going on?
Another form of representing energy is Joule (J). You get one joule of energy if a power of one Watt is applied for one second. How many joules are there in a kWh?