Curriculum
Course: Igcse Physics
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Curriculum

Igcse Physics

1. Motion, Forces and Energy

0/161 Dr Dabour Hub Science Diagram and Course Material

2. Thermal Physics

0/75 Dr Dabour Hub Science Diagram and Course Material

3. Waves

0/77 Dr Dabour Hub Science Diagram and Course Material

4. Electricity and Magnetism

0/119 Dr Dabour Hub Science Diagram and Course Material

5. Nuclear Physics

0/39 Dr Dabour Hub Science Diagram and Course Material

6. Space Physics

0/47 Dr Dabour Hub Science Diagram and Course Material
Quiz

4.4.7 Electric Motors – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
The commutator in a d.c. motor
makes the current alternating
makes the field uniform
reverses the magnetic field
reverses the current in the coil every half turn
2.
The forces on the two sides of the coil are
in the same direction
in opposite directions
zero
along the axle
3.
Which change would NOT increase the speed of a simple motor?
Reducing the magnet strength
Stronger magnets
Larger current
More turns
4.
The battery connections are swapped in a simple motor. The motor
stops
runs the same
runs faster
runs in the opposite direction
5.
Why does a real motor use several coils?
To use less current
To make the turning effect smoother
To avoid heating
To turn the field
6.
A motor draws a larger current when stalled because
the coil resistance rises
the magnets are stronger
there is no induced back e.m.f.
the supply voltage rises
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Part of 4. Electricity and Magnetism — see every lesson and quiz in this unit.
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