Electromagnetic induction in transformers (Edexcel GCSE Physics Combined Science): 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 voltage
What is the main purpose of transformers?
What is the main purpose of transformers?
To change the voltage of electricity
What is required for electromagnetic induction to occur?
What is required for electromagnetic induction to occur?
Relative movement between field & wire
What type of current is created when a magnet or wire rotates continuously?
What type of current is created when a magnet or wire rotates continuously?
Alternating current (AC)
What does the magnetic field created by an induced current do?
What does the magnetic field created by an induced current do?
Opposes the change that caused it
What is the role of the iron core in a transformer?
What is the role of the iron core in a transformer?
Links field between coils efficiently
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
Which method increases the induced voltage in a coil?
Which method increases the induced voltage in a coil?
Adding more turns of wire in the coil
Are transformers 100% efficient?
Are transformers 100% efficient?
No, some energy is lost as heat
Where is energy lost in a transformer?
Where is energy lost in a transformer?
As heat in the coils and core
Why are step-up transformers used in power transmission?
Why are step-up transformers used in power transmission?
High voltage reduces energy loss