Electromagnetism GCSE Physics AQA (higher)

Quiz on every sentence in the AQA revision guide chapter 3.4 (although in the book, the second 3.1 - OMG.)

Teacher recommended

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What is the motor effect?
When a wire carrying an electric current is placed in a magnetic field
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When is the force at maximum?
When the wire is at an angle to the magnetic field
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When is the force "zero"?
When the wire is parallel to the magnetic field
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How can the size of the force be increased?
next.
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What would make the direction of the force on the wire change?
a change in the direction of the current a change in the direction of the magnetic field.
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How is the speed of the motor increased?
increasing the size of the current
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How can the direction of the motor be reversed?
reversing the direction of the current
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Why does the coil spin when the current passes through the coil?
A force moves on either side due to the motor effect
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Why does the coil spin when the current passes through the coil?
the forces go in opposite directions either side of the coil
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What does the split-ring commutator do?
changes the direction of the current every half tun
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What happens if a wire cuts through magnetic field lines?
a potential difference is induced across ends of the wire
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What happens if a magnet is moved into a coil of wire?
a potential difference is introduced across the ends of a wire
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What happens if the wire or coil is part of a complete circuit?
A current is induced in the circuit
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What happens in a dynamo?
A magnet spins, causing magnetic frild lines to continuously cut across the wires of a coil, inducing an alternating pd.
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What happens in a generator?
a coil is rotated inside a stationary magnetic field
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The faster the coil rotates.....
the larger the peak value of the alternating current
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What are they called?
primary, secondary, tertiary coil etc
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What are they made of?
insulated wire
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What are they wound around?
the same iron core
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What happens when an alternating current passes through the first/primary coil?
a magnetic alternating current flows around the core
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What does this alternating current do?
expand and collapse continuously
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What produces an alternating potential difference across the lines of the 2nd/secondary coil?
alternating magnetic current field lines
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How is an alternating current produced?
if it is part of a circuit
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Are the coils insulated?
yes
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Why?
so the current does not cut short and flows around the whole coil
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Why is/are the core(s) made of a particular substance?
So it/they are easily magnetised
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In a step-up transformer, which coil has the greater p.d?
2
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In a step-down transformer, which coil has the lesser p.d?
2
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p.d across 1/p.d across 2 =
no of turns on 1/no of turns on 2
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Why are step-up transformers used?
to reduce the energy loss in power cables
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Why are step-down transformers used?
to make it safer for consumers
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What direction is the force produced by the motor effect?
perpendicular
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What happens if a magnet is moved into a coil of wire?
a potential difference is induced at the end of the wires
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Hot weather. good or bad?
ALL THE GOODNESS OF EVERYTHING EVER.
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Other cards in this set

Card 2

Front

When is the force at maximum?

Back

When the wire is at an angle to the magnetic field

Card 3

Front

When is the force "zero"?

Back

Preview of the front of card 3

Card 4

Front

How can the size of the force be increased?

Back

Preview of the front of card 4

Card 5

Front

What would make the direction of the force on the wire change?

Back

Preview of the front of card 5
View more cards

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CoggyPoggyWogg

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Thank you, I do my best

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