Transformers (OCR GCSE Physics A (Gateway Science Suite)): Flashcards
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What does a transformer do?
What does a transformer do?
Changes voltage of AC supply
Step-up transformer function
Step-up transformer function
Increases voltage
Step-down transformer function
Step-down transformer function
Decreases voltage
Basic transformer structure
Basic transformer structure
Two coils of wire (not connected) & iron core
Why transformers don't work with DC
Why transformers don't work with DC
DC produces constant magnetic field (no change to induce current)
What current flows in primary coil?
What current flows in primary coil?
Alternating current (AC)
What does primary coil produce?
What does primary coil produce?
Changing magnetic field
Role of iron core in transformer
Role of iron core in transformer
Passes changing magnetic field through (easily magnetised)
What's induced in secondary coil?
What's induced in secondary coil?
Alternating potential difference (AC voltage)
Transformer use in National Grid
Transformer use in National Grid
Increase voltage before transmission
Transformer use for homes
Transformer use for homes
Lower high voltage to safe levels
Effect of more coils on secondary
Effect of more coils on secondary
Step-up transformer - voltage increases
Effect of fewer coils on secondary
Effect of fewer coils on secondary
Step-down transformer - voltage decreases
Transformer equation
Transformer equation
Are transformer coils connected?
Are transformer coils connected?
No, they are not connected