Two coils in a transformer - Primary coil and secondary coil, Transformer that increases voltage - Step up transformer, Transformer that decreases voltage - Step down transformer, Purpose of transformers - To allow electricity to be transported with low current, Why must low current be used in electricity transportation? - Current has a heating effect so energy is lost at high current, Voltage in homes - 240V, Type of current used in transformers - a.c., What does an alternating current produce in transformer? - Alternating magnetic field, What does an alternating magnetic field produce in a coil? - Induced voltage, Why is a soft iron core used in transformers? - Increases magnetism, In a transformer, input power = - output power, How is the voltage changed in a transformer? - By changing number of turns on the coil.,

Transformers

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