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Electricity, its effects and measurements; conductors, insulators and circuits; transformers and motors; primary cell and accumulator batteries; switchgear, distribution and wiring; flexible cords, cables, circuits and testing; installation accessories and switching; lighting; electric space and water heating; domestic appliances and the caravan; layout of a typical installation; radio and T.V. aerials, recorders, telephone communication and static; electrical safety and treatment for shock and burns.