GCSE PHYSICS ELECTROMAGNETISM
GCSE PHYSICS High Demand Questions
ELECTROMAGNETISM QUESTIONSHEET 1
Here is a diagram of an electric bell.
A
B C E
D
Explain how the bell works by referring to the parts labelled A ? E.
............................................................................................................................................................................. ............................................................................................................................................................................. ............................................................................................................................................................................. ............................................................................................................................................................................. ............................................................................................................................................................................. ............................................................................................................................................................................. ............................................................................................................................................................................. ............................................................................................................................................................................. ............................................................................................................................................................................. .........................................................................................................................................................................[7]
TOTAL / 7
GCSE PHYSICS
ELECTROMAGNETISM
High Demand Questions
QUESTIONSHEET 2
(a) A large electromagnet is used in a scrap yard to move old cars.
(i) Name a suitable material for the electromagnet. .........................................................................................................................................................................[1] (ii) Explain your choice. ............................................................................................................................................................................. .........................................................................................................................................................................[2] (b) A car of mass 1600 kg can be just be lifted. What is the least force that the electromagnet must use to lift the car? (1 g = 10 N/kg) ............................................................................................................................................................................. ............................................................................................................................................................................. .........................................................................................................................................................................[2]
TOTAL / 5
GCSE PHYSICS
ELECTROMAGNETISM
High Demand Questions
QUESTIONSHEET 3
Describe a simple electric motor. Include a simple diagram in your answer.
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[7]
TOTAL / 7
GCSE PHYSICS
ELECTROMAGNETISM
High Demand Questions
QUESTIONSHEET 4
(a) An electric motor is connected to the external circuit via a split ring commutator.
pivot
magnet
A
N split-ring commutor
coil
S
B
carbon brushes
Explain the purpose of this. ............................................................................................................................................................................. .........................................................................................................................................................................[3] (b) (i) How could the motor be used as a generator ? .........................................................................................................................................................................[1] (ii) The current produced would be a varying direct current (dc).
What changes would be needed for the generator to produce an alternating current (ac) instead ? ............................................................................................................................................................................. .........................................................................................................................................................................[2]
TOTAL / 6
GCSE PHYSICS
ELECTROMAGNETISM
High Demand Questions
QUESTIONSHEET 5
(a) The diagram shows a relay circuit used in a car starter motor.
starter relay solenoid
starter motor
iron core
thick wires
heavy current contacts made of iron
ignition switch thin wires
car battery (12V)
What happens when the ignition is switched on ? ............................................................................................................................................................................. ............................................................................................................................................................................. .........................................................................................................................................................................[3] (b)Why is the battery always connected to the starter motor with very thick cables ? .........................................................................................................................................................................[1] (c)Draw a circuit diagram showing the battery connections.
[3] TOTAL / 7
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