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GCSE Combined Science · key term
The input coil of a transformer, connected to the incoming electrical supply.
Used by AQA and Edexcel
Specification 6.2.4.3 · Paper 5, Paper 6
Revise: The National GridThe primary coil is the transformer’s input and the secondary coil is its output. For a transformer treated as perfectly efficient, the electrical power input equals the electrical power output.
Paper 5, Paper 6
The coil of a transformer connected to the input alternating supply.
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A transformer has a primary coil, connected to an alternating supply, and a secondary coil, connected to the output circuit. Both are wound around an iron core. Iron is useful because it is easily magnetised.