Английский язык. Арланова Т.Л - 20 стр.

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To reverse the direction of the current, the ends of the armature wire are

connected to different halves of a split ring called a commutator. Current

flows to and from the commutator through small carbon blocks called

brushes. As the armature turns, first one half of the commutator comes into

contact with the brush delivering the current, and then the other, so the

direction of the current keeps being reversed.

Source: Adapted from 'Inside out: Electric Motor', Education Guardian

Exercise 5. Match each of these diagrams with the correct description. A, B,

C. or D. One of the descriptions does not match any of the diagrams. (The

diagrams are in the correct sequence, but the descriptions are not).

Motor run on direct current

The armature turns a quarter of a turn. Then electric contact is broken

because of the gap in the commutator, but the armature keeps turning

because there is nothing to stop it.