Bodies that are able to attract or repel things in this way are said to be 'electrified', or to be 'charged with electricity'. When two different substances are rubbed together, an electrical charge is produced because one of them will give electrons to the other. The reason is that the atoms in the two substances have unequal power to attract electrons. So the one that is more able to attract electrons will take electrons from the one that has a lower attractive force. If glass is rubbed against something else, it may either give or take electrons. What happens depends on what the other thing is.