Transformers (OCR GCSE Physics A (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What does a transformer change in an alternating current supply?
What does a transformer change in an alternating current supply?
Potential difference
What type of transformer increases the potential difference?
What type of transformer increases the potential difference?
Step-up transformer
What type of transformer decreases the potential difference?
What type of transformer decreases the potential difference?
Step-down transformer
Why do transformers not work with direct current?
Why do transformers not work with direct current?
DC magnetic field does not change
What are the two coils in a transformer wrapped around?
What are the two coils in a transformer wrapped around?
An iron core
Why is iron used as the core in a transformer?
Why is iron used as the core in a transformer?
It is easily magnetised
What produces the magnetic field in the primary coil?
What produces the magnetic field in the primary coil?
Alternating current flowing through it
What type of current is induced in the secondary coil?
What type of current is induced in the secondary coil?
Alternating current
How many coils does a step-up transformer have on the secondary compared to the primary?
How many coils does a step-up transformer have on the secondary compared to the primary?
More coils
How many coils does a step-down transformer have on the secondary compared to the primary?
How many coils does a step-down transformer have on the secondary compared to the primary?
Fewer coils
Why are transformers used before transmitting electricity across the National Grid?
Why are transformers used before transmitting electricity across the National Grid?
To increase the voltage
Why are transformers used when electricity from power lines enters homes?
Why are transformers used when electricity from power lines enters homes?
To lower high voltage to safe levels