[Illustration: FIG. 232.--The electric street car.]
The motor is of value because by means of it motion, or mechanical
energy, is obtained from an electric current. Nearly all electric
street cars (Fig. 232), are set in motion by powerful motors placed
under the cars. As the armature rotates, its motion is communicated by
gears to the wheels, the necessary current reaching the motor through
the overhead wires. Small motors may be used to great advantage in the
home, where they serve to turn the wheels of sewing machines, and to
operate washing machines. Vacuum cleaners are frequently run by
motors.
|