1. Chapter 18 Electric Circuits Chapter Opening 18.1 Electric circuits and electric current 18.2 Electrical energy and voltage 18.3 Resistance and Ohm’s law 18.4 Series and parallel circuits 18.5 Resistance of ammeters, voltmeters and cells E

2. Lessons How electrical appliances work Electric circuits Electric current Check Point Key Ideas 18.1 Electric circuits and electric current

3. Lessons Energy transformation in an electric current Voltage Check Point Key Ideas 18.2 Electrical energy and voltage

4. Definition of resistance Measuring resistance Ohm’s law Effect of temperature on resistance Effect of length and cross-sectional area on resistance Resistor Check Point Key Ideas 18.3 Resistance and Ohm’s law Lessons

5. Practical 18.1 – Ohm’s law Related Practical Practical 18.2 – Effect of temperature on resistance Practical 18.3 – Effect of length and thickness on resistance of a wire 18.3 Resistance and Ohm’s law

6. Lessons Series and parallel circuits Resistors in series Resistors in parallel Check Point Key Ideas 18.4 Series and parallel circuits

7. Lessons Effects of resistance of ammeters and voltmeters Effects of resistance of cells Check Point Key Ideas 18.5 Resistance of ammeters, voltmeters and cells E