I do not understand the concept of electrical ground, or why it works. Let me explain. In elementary school physics, one learns that for a current to take place, you need a battery with positive and negative poles. This creates a voltage that makes charges run from plus to minus, because pluses would like to be with minuses. So therefore, if you connect wires and a lamp, you can make the lamp shine. This is how I learnt that an electric current arise. So I cannot understand, how there could be a current from, for instance the plus pole of the battery to the earth - there are no minuses in the earth that would attract the pluses, the earth is neutral (as opposed to the minus pole on the battery that is negative).