# KS3 Year 7 Electricity

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1. Which type of circuit only has one route for electricity to flow?
Series
2. What is the symbol for an ammeter?
3. What is the symbol for a buzzer?
4. Metals are good conductors of electricity. Why it is important to make sure that the ends of wires are clean and free from rust?
• Rust or dirt on the surface of metals can stop electricity flowing through to the metal underneath (rust is not a metal and is not a good conductor)
5. What is the difference between a cell and a battery?
A battery is made up of two or more cells
6. Is wood an insulator or a conductor of electricity?
Insulator (it does NOT CONDUCT)
7. What do we call materials that do not conduct electricity?
Insulators
8. What do we call a flow of electrons around a circuit?
An electrical current
9. In the series circuit below, what happens to the first lamp if the second lamp fails?
It goes out.
10. Should voltmeters be connected in series or parallel?
Voltmeters should always be connected in parallel
11. Will bulbs be brighter if they are connected in series or parallel?
• Parallel
12. Which of these bulbs will be the brightest when the switch is closed? (current flows from positive to negative)
They will all be the same brightness
13. What is the unit of electrical current?
Amperes (Amps) (A)
14. Electrons transfer their energy to components (eg bulbs) in an electrical circuit as they pass them. What gives the electrons their energy?
The cell (or battery)
15. In the water model of electricity, what does the water pump represent?
The cell (or battery)
16. Name a disadvantage of a parallel circuit
It uses more wire
17. State a disadvantage of connecting lamps in a series circuit
If one lamp fails then all the lamps will go out
18. What is the difference between a series and a parallel circuit?
Series circuits only have one route for the electrons to flow. Parallel circuits have more than one route.
19. Is this a series or parallel circuit?
Series (as there is only one route that the electrons can take)
20. What will happen when this circuit is switched on?
Nothing. There is a break in the circuit so electrons cannot return to the battery. No current will flow.
21. What will happen in this circuit?
The current will flow around the wires but not through the bulbs so the bulbs will not light. The battery will run down quickly as there is nothing to slow the current.
22. Why won't this circuit work?
The cells are pushing against each other
23. What effect will adding an extra battery to this circuit have?
It will make the bulbs brighter
 Author: HLHSscience ID: 218262 Card Set: KS3 Year 7 Electricity Updated: 2013-05-13 21:05:52 Tags: KS3 Year7 Electricity Folders: Description: Year 7 electricity Show Answers: