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Проверочная работа "The Electric Motor"

Student’s name
THE ELECTRIC MOTOR
Task 1. Name all the main parts of the electric motor.
Task 2. Match words with their definitions.
1
armature
a
the electrically conducting circuit, usually a number of
coils wound on individual poles and connected in
series, that produces the magnetic field in a motor
2
commutator
b
a mechanical component for rotation, usually used to
connect other components that cannot be connected
directly because of distance
3
brush
c
one of the two principal electrical components of an
electric motor
4
drive shaft
d
a machine element that reduces friction between
moving parts
5
bearing
e
a device which conducts current between stationary
wires and moving parts
6
field winding
f
a moving part of a rotary electrical switch in certain
types of electric motors and electrical generators that
periodically reverses the current direction
1- ___ ; 2- ___; 3- ___; 4-___; 5- ___; 6- ___.
Task 3. Put sentences in the correct order.
The armature becomes an electromagnet.
Commutator reverses the direction of the current flow.
Current flows through the brushes.
The armature turns.
The poles of the electromagnet have changed and turning movement continues.
The north pole of an electromagnet is attracted to the south pole and repelled
by the north pole of the field windings.
Task 4. Complete the chart according to the text.
Task 5. Fill in the gaps.
1. A _____________________ is produced by an electric current and a magnetic field.
2. The ___________ and _____________ between poles make an armature turn and the
direction of the current keeps being reversed as the commutator comes into contact with ________ .
3. An electric current runs through a wire produces a magnetic field around the _________.
4. ____________ makes current flow in a different direction.
5. Electromagnet is a material which has north and south _________.
6. If you put two like poles together they will ________ and __________ poles will attract.
7. In a simple electric motor, an armature is made of __________ and a piece of __________.
KEYS
Task 1. brushes, alternator, field windings, bearing, commutator, driveshaft, stator windings, motor
frame.
Task 2. 1-c, 2-f, 3-e, 4-b, 5-d, 6-a.
Task 3. a-2, b-5, c-1, d-4, e-5, f-3.
Task 4. 1 – field magnet, 2 – armature, 3- commutator, 4 – brushes.
Task 5. 1 – turning movement, 2 – attraction, repulsion, brushes, 3 – armature, 4 – commutator, 5 –
poles, 6 – repel, unlike, 7 – wire, iron.
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