1. © Oxford University Press 2011 IP2.18.2 Images Images

2. © Oxford University Press 2011 IP2.18.2 Images Open and closed switch

3. © Oxford University Press 2011 IP2.18.2 Images Cell

4. © Oxford University Press 2011 IP2.18.2 Images Battery

5. © Oxford University Press 2011 IP2.18.2 Images Diode

6. © Oxford University Press 2011 IP2.18.2 Images Resistor

7. © Oxford University Press 2011 IP2.18.2 Images Variable resistor

8. © Oxford University Press 2011 IP2.18.2 Images Lamp

9. © Oxford University Press 2011 IP2.18.2 Images Fuse

10. © Oxford University Press 2011 IP2.18.2 Images Voltmeter and ammeter

11. © Oxford University Press 2011 IP2.18.2 Images Thermistor

12. © Oxford University Press 2011 IP2.18.2 Images Light-dependent resistor (LDR)

13. © Oxford University Press 2011 IP2.18.2 Images Light-emitting diode (LED)

14. © Oxford University Press 2011 IP2.18.2 Images A simple circuit with a battery, lamp and switch

15. © Oxford University Press 2011 IP2.18.2 Images The circuit diagram for the circuit shown in the previous photo

16. © Oxford University Press 2011 IP2.18.2 Images Two simple circuits. It will take charged electrons longer to move around the circuit with three resistors. The flow of charge is slower. In other words, the current is smaller.