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Basic electrics 619 Automotive electrical components 620 Nature of electricity 621 Electron flow 622 Current flow 623 Types of electrical materials 623 Summary of basic electrics 624 Practical conductors, resistors and insulators 625 Factors affecting current flow 627 The language of electricity 627 Electrical circuits 630 Parallel and series connections 630 Voltage drop in a circuit 632 Technical terms 633 Review questions 633