PHY_10_8_V2_P_Applications of magnetic forces and fields

1

to explain the operating principle of electrical measuring instruments, electric engines;

2

(G) Group work. Fill in the blank spaces

A simple DC motor has just 4 main parts:
• The Rotor, made up of a 1)................................. mounted on an axle to allow it to 2)..................................
• The 3).................................. which provides the magnetic field, from either
a 4)............................... magnet, or an 5)...........................................
• The Brushes, which maintain 6)......................... contact between the electricity supply and the rotating coil.

• The 7)...................................., which causes the current to 8)............................. every half-turn. The Motor Effect is also involved in the operation of a 9).....................
............................., and a moving-coil loudspeaker. In an electric meter, the needle moves along a calibrated scale because of the 10)............................ on a coil inside a 11).................................
(shape) magnetic field. In a loudspeaker, the sound is produced by 12)............................ of a speaker cone. In turn, this is made to vibrate by a coil’s magnetic field 13).....................................
with a permanent magnet.

(I) Individual workLonger Response Questions

What has been learned
What remained unclear
What is necessary to work on