Transformers
- Created by: Jasmin
- Created on: 16-05-13 12:56
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- Transformers
- Used to change the size of alternating pd
- Step up transformers
- Step voltage up
- More turns on secondary coil than primary
- Greater pd on secondary than primary
- Step down transformers
- Steps voltage down
- More turns on primary coil than secondary
- Secondary less pd than primary
- Electromagnetic induction
- Primary coil produces mf which stays within iron core - nearly all passed to secondary hardly any lost
- AC in primary coil - connected to AC supply
- Field constantly changing direction, felt by secondary
- Changing field induces alternating pd across secondary
- Number of turns determines whether pd induced in secondary is greater or less than pd in primary
- Only AC not DC (no change in field - secondary pd = 0)
- Iron core
- Transfers changing mf from primary to secondary
- No current flows through
- Core is laminated to cut out induced currents in iron layers
- If not laminated efficiency reduced
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