Electromagnetic induction in transformers (Edexcel GCSE Physics): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is electromagnetic induction?
What is electromagnetic induction?
A changing magnetic field creates electricity
What do transformers use electromagnetic induction to do?
What do transformers use electromagnetic induction to do?
Change voltage
What must happen for electromagnetic induction to occur?
What must happen for electromagnetic induction to occur?
Magnetic field and conductor move relative to each other
What type of current is created when a magnet or wire rotates?
What type of current is created when a magnet or wire rotates?
Alternating current (AC)
What does the magnetic field from an induced current do?
What does the magnetic field from an induced current do?
Opposes the change that caused it
What is the function of the iron core in a transformer?
What is the function of the iron core in a transformer?
Links magnetic field & ensures efficiency
What type of current flows into the primary coil of a transformer?
What type of current flows into the primary coil of a transformer?
Alternating current (AC)
How does a step-up transformer increase voltage?
How does a step-up transformer increase voltage?
More turns in secondary than primary
What characterises a step-down transformer?
What characterises a step-down transformer?
Fewer turns in secondary coil
How can you increase the induced voltage in a coil?
How can you increase the induced voltage in a coil?
Add more turns of wire to the coil
Are transformers 100% efficient?
Are transformers 100% efficient?
No, energy is lost as heat
Why are step-up transformers used for power lines?
Why are step-up transformers used for power lines?
To reduce energy loss over long distances