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6. Potential difference = current x charge
7. What do we mean by resistance?
- Opposition to current flow
- Flow of charge
8. What effect does reversing a potential difference across a filament lamp have?
- Nothing happens
- The resistance increases
- The resistance decreases
- The current increases
9. The resistance of a filament lamp decreases as the current increases
10. What is the equation for current?
- resistance of supply x number of lamps
- p.d. of supply / total resistance
- p.d. of supply x total resistance
11. What component's resistance decreases as the temperature increases?
- A fuse
- A thermistor
- A Light Dependent Resistor
- A diode
12. When components are joined in parallel, the potential difference across each component is the same.
13. An ammeter is placed in parallel.
14. What is the frequency of the UK mains supply?
15. Direct current flows in one direction only.
16. What is the voltage of the mains supply?
17. What colour is the live wire?
- Purple
- Yellow/green
- Brown
- Red
- Blue
18. What wire is coloured blue?
- Earth wire
- Neutral wire
- Live wire
19. Why are the pins of the plug made with brass?
- Brass is ductile
- Brass is a good conductor, hard and does not corrode
- Brass is soft and easily corrodes
20. A fuse's rating should be
- slightly higher than the normal working current of the appliance
- slightly lower than the normal working current of the appliance
- the same as the normal working current of the appliance of
- much higher than the normal working current of the appliance
- much lower than the normal working current of the appliance