Английский язык. Арланова Т.Л - 19 стр.

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iron through it, the iron becomes magnetized. It is called an electromagnet;

one end becomes a north pole and the other a south pole, depending on

which way the current is flowing around the loop.

Fig. 1

If you put two magnets close together like poles- for example, two north

poles-repel each other, and unlike poles attract each other.

In a simple electric motor, like the one shown in Fig. 2, a piece of iron

with loops of wire round it, called an armature, is placed between the north

and south poles of a stationary magnet, known as the field magnet. When

electricity flows around the armature wire, the iron becomes an

electromagnet.

The attraction and repulsion between the poles of this armature magnet

and the poles of the field magnet make the armature turn. As a result, its

north pole is close to the south pole of the field magnet. Then the current is

reversed so the north pole of the armature magnet becomes the south pole.

Once again, the attraction and repulsion between it and the field magnet

make it turn. The armature continues turning as long as the direction of the

current, and therefore its magnetic poles, keeps being reversed.