Transformers in action
- Created by: Jasmin
- Created on: 16-05-13 13:07
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- Transformers in action
- Energy supplied by National Grid
- Higher the grid pd, greater the efficiency of transferring electrical power through the grid
- If grid pd were lower more current would be needed to deliver the same amount of power
- Grid cables heat up and waste more energy
- Vp/Vs=np/ns
- Step up - ns greater than np therefore vs greater than vp
- Step down - ns less than np therefore vs less than vp
- Transformer efficiency
- VpIp = VsIs
- Switch mode transformers
- Operate at higher frequencies
- Can be made lighter, smaller than traditional transformers that work from 50Hz main supply
- Ferrite core not iron
- Can be made lighter, smaller than traditional transformers that work from 50Hz main supply
- 50000Hz to 200000Hz
- Mobile, laptop chargers
- More efficient - use little power when switched on but no load is applied
- Operate at higher frequencies
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