IGCSE Physics / Electric motors and electromagnetic induction

Transformers revision notes

Edexcel International GCSE Physics (4PH1), chapter 21: Electric motors and electromagnetic induction, specification point 6.17P. Part of the full course.

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A transformer uses a changing magnetic field to transfer energy between two coils and change an alternating voltage. The number of turns on the secondary coil determines whether the output voltage is higher or lower.

More lessons in Electric motors and electromagnetic induction

• The motor effect
• Fleming's left-hand rule
• The simple d.c. electric motor
• The loudspeaker
• Electromagnetic induction
• Generating electricity: the a.c. generator
• Transformer calculations
• Transmitting electricity: why the voltage is stepped up