Step up transformer - More turns on secondary coil than primary, Step down transformer - Fewer turns on secondary coil than primary, Iron Core - Carries changing magnetic field from primary to secondary coil, Increased efficiency - Why do we need to use transformers in the national grid, 230 V - Voltage that is safe for homes, Decrease current, increase voltage - What a step up transformer does, Decrease voltage, increase current - What a step down transformer does, Alternating Current - Transformers only work with this type of current, Primary coil - Input voltage in this coil, Secondary coil - Output voltage on this, 25 kV - Typical voltage at power station, 400 kV - Typical transmission voltage along overhead wires,

Transformers

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