CONCEPTS: Definition and unit for electric current Effects of electric current (heating, chemical and magnetic) Joule’s law
Domestic circuits (plugs, fuses, MCBs, RCDs, ring and radial circuits, bonding, earthing, and general safety precautions)
The kilowatt-hour as a unit of electrical energy MANDATORY EXPERIMENTS: 20. Verification of Joule’s law ACTIVITIES: Using an ammeter to investigate if a substance is a conductor or an insulator Demonstration of heating effect of an electric current Demonstration of chemical effect of an electric current Demonstration of magnetic effect of an electric current Wiring a plug SCIENCE,TECHNOLOGY AND SOCIETY: Everyday examples of the heating, chemical and magnetic effects Conventional current Electrical safety Electricity at home (fuse box, meter, etc.) PHYSICAL QUANTITIES INTRODUCED IN THIS CHAPTER: Quantity
electric current electrical energy
Symbol I
W kilowatt-hour* *kilowatt-hour is not an SI unit, but is used in some calculations.