IGCSE Physics / Current and voltage in circuits
Series or parallel: which and why
Edexcel International GCSE Physics (4PH1), chapter 7: Current and voltage in circuits, specification point 2.7, 2.12. Part of the full course.
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House lights are connected in parallel so each lamp gets the full mains voltage and works independently. Series circuits are useful when a component needs to control, interrupt or share the current in one path.