That means you're giving up energy that turns into heat and will heat, heat that element up.

这意味着你放弃了转化为热量的能量，并将其加热。

These are little machines that have heating elements in them, that you plug into the wall so that the electricity heats up the heating elements and you can heat up a small area or a small room.

这些是里面有加热元件的小机器，你把它们插到墙上， 这样电就可以加热加热元件， 你可以加热一个小区域或一个小房间。