Electromagnetic induction in transformers (Edexcel GCSE Physics): Flashcards
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What is electromagnetic induction?
What is electromagnetic induction?
When a changing magnetic field creates electricity in a wire
What do transformers do?
What do transformers do?
Change voltage (step-up or step-down)
How does electromagnetic induction occur?
How does electromagnetic induction occur?
Magnetic field and conductor move relative to each other
One way to create electromagnetic induction
One way to create electromagnetic induction
Move a magnet near a coil of wire
What does induced current create?
What does induced current create?
Magnetic field that opposes the change
What is the primary coil in a transformer?
What is the primary coil in a transformer?
Coil where alternating current (AC) flows in
What is the secondary coil in a transformer?
What is the secondary coil in a transformer?
Coil where transformed voltage comes out
What is the purpose of iron core in transformer?
What is the purpose of iron core in transformer?
Links magnetic field between coils, efficient energy transfer
Step-up transformer coil characteristic
Step-up transformer coil characteristic
More turns in secondary coil than primary
Step-down transformer coil characteristic
Step-down transformer coil characteristic
Fewer turns in secondary coil than primary
Three ways to increase induced voltage
Three ways to increase induced voltage
Stronger field, faster movement, more coil turns
Are transformers 100% efficient?
Are transformers 100% efficient?
No, some energy is lost as heat in coils and core