1. Electronics revision Electronics Revision Part 1

2. When certain insulating materials are rubbed against each other they become electrically charged. Negatively charged _______ are rubbed off one material onto the other. Electrons

3. The material that gains electrons becomes _______ charged. negatively

4. The material that loses electrons is left with a _______ charge. positive

5. When two electrically charged objects are brought together they feel a ____ from each other. force

6. Two objects that have different types of charge _______. attract

7. Two objects that carry the same type of charge ____. repel

8. The rate of flow of electrical charge is called the _____. current

9. If the potential difference becomes high enough a ____ may jump across the gap between the object and any earthed conductor near it. spark

10. Electrostatic charges can be useful, for example in _________ photocopiers

11. Switch

12. Bulb

13. fuse

14. cell

15. Voltmeter

16. battery

17. ammeter

18. resistor

19. Thermistor

20. Variable resistor

21. L.D.R.

22. potential difference current resistance (volt, V) (ampere, A)(ohm, Ω)

23. The resistance of a filament lamp ________ as the temperature of the filament increases. increases

24. The current through a diode flows in ___ direction. one

25. 5How does the voltage vary around a series circuit? 4Why does the current not change around a series circuit? 3How does the current vary around a parallel circuit? What happens at each T-junction? 2A simple parallel circuit – battery and two bulbs – again with symbols. 1A simple series circuit – battery and two bulbs – using symbols and labelled.