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เนื้อหาย่อ : Contents Acknowledgements Symbols and Units in Electricity Pietorial symbols in electricity THE BASIC ENGINEERING CRAFT STUDIES COURSE 1. Basic electrical theory 2. Types of examination question ELECTRICAL MATERIALS Conduction of electricity through a liquid Conduction Conductors used in the elec of electricity through a gas electrical industry Raistar Volt drop stance and temperature & Volt drop using tables in the L.E.E. Regulations 9. Insulators or dielectrics HEAT-CAUSE AND EFFECT Quantity of heat 2 Electrical energy and heat 3 Chemical ener 4. Mechanical (kinetic) energy and heat ergy and heat . Efects of heating a substance 6. Measurement of temperature 1. Efect of tempe erature rise upon conductor resistance &. Transier of heat 9. Consumer heating appliances Practical applications of electrical heating L Consumer lighting ap 12. Effect of an overload current 13. Fuses Rating and fusing factors iS. Thermal overload devices MAGNETISM AND ELECTRICITY L.Blementary laws of magnetism 2 Efect produced when a current flows through a conductor 1.Eflect of a core of magnetic material 4 The magnetic ic circuit 5. Therelay 6. The electric bell 1. Multi-point call systems ATheleiephone 9.The loudspeaker Conduetion of elecriery Lrough a solid LaCeandanict coptalo by dhension and masenial ppliances 않旺