Lesson 4.7.2.3
4.7.2.3 Electric motors (HT only) Quiz: AQA Physics, Unit 7
20 questions
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Lesson 4.7.2.3, Electric motors (HT only): 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 7: Magnetism and electromagnetism, written with Revision Ninja.
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The 20 questions
-
(Higher tier) What does a coil of wire carrying a current in a magnetic field tend to do?
- Become a permanent magnet
- Heat up only
- Rotate
- Stay perfectly still
-
What physical principle is the basis of an electric motor?
- Heating effect
- Generator effect
- Motor effect
- Electromagnetic induction
-
Why does the coil of an electric motor rotate?
- Zero torque
- Equal forces
- Parallel attraction
- Opposite forces
-
Which change makes an electric motor's coil turn faster?
- Decreasing voltage
- Removing magnet
- Increasing current
- Increasing resistance
-
What causes the coil in an electric motor to rotate?
- Frictional force
- Gravitational force
- Electrostatic force
- Magnetic force
-
Why is the coil of a motor placed inside a magnetic field?
- To prevent heating
- To stop rotation
- To experience forces
- To increase mass
-
What happens when the current in a motor's coil is reversed?
- Direction reverses
- Motor stops
- Resistance drops
- Speed doubles
-
(Higher tier) Which device converts electrical energy into kinetic energy using the motor effect?
- A transformer core
- An electric motor
- An alternator unit
- A dynamo, a generator
-
What is the force on a motor coil side when it is at right angles to the magnetic field?
- Zero force
- Half the maximum
- Minimum force
- Maximum force
-
Which change increases the rotational force produced by an electric motor?
- Removing the core
- Decreasing current
- Increasing magnetic flux density
- Shortening the coil
-
(Higher tier) A motor has a stronger magnet. What is the effect on the force on its coil?
- A larger force
- A smaller force
- Electricity is produced
- No force
-
What energy transfer occurs in a working electric motor?
- Kinetic to electrical
- Potential to kinetic
- Chemical to thermal
- Electrical to kinetic
-
What component in a direct current motor reverses the current direction every half turn?
- Carbon brushes
- Slip rings
- Split-ring commutator
- Armature core
-
What components provide the magnetic field inside a standard electric motor?
- Insulated split rings
- Carbon brushes only
- Copper coils only
- Permanent magnet or electromagnet
-
Which change causes a motor's coil to rotate in the opposite direction?
- Increasing resistance
- Reducing potential difference
- Reversing current direction
- Shortening the coil
-
(Higher tier) Doubling the current in a motor's coil, with the field unchanged, does what to the force on each side?
- Quadruples it
- Stays the same
- Halves it
- Doubles it
-
(Higher tier) A conductor is moved through a magnetic field and produces a voltage. Which effect is this?
- The electrostatic effect
- The thermal effect
- The generator effect
- The motor effect
-
Which device relies upon the generator effect rather than the motor effect?
- Loudspeaker
- Headphones
- Electric motor
- Dynamo
-
Why does a motor coil rotate rather than move in a straight line?
- Opposite forces create moment
- Gravity pulls it down
- Friction stops linear motion
- Current alternates direction
-
Why must the coil in an electric motor carry an electrical current?
- To charge the magnets
- Current experiences magnetic force
- To prevent resistance
- To generate thermal energy
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