7j Electricity Test 2004
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Do not write on this sheet! For questions 1 to 8 chose the correct word from each set of brackets to make each sentence correct 1. To make an electric device work you need a (plastic/cell/complete/incomplete) circuit. 2. Wires have metal in them because they (generate/resist/produce/conduct) electricity 3. An electric bulb gives out (light/sound/chemical/nuclear) energy and heat energy. 4. The flow of electricity through a wire is called (current/electron/voltage/power). 5. A small wire that melts if the current gets too big is called a (filament/fuse/fail). 6. Electric current is measured in (Amps/volts/ohms/seconds) 7. An ammeter must be connected in (series/parallel). 8. A longer wire will be more difficult for electrons to flow through. We say that the longer wire has a bigger (resistor/resistance/resist/refraction) 9. The more bulbs that you put in series in a circuit, the (brighter/dimmer/hotter) they become.
Look at diagrams A to D to answer questions 1 to 6. 10
In which of the
circuits above are the bulbs brightest? A, B, C or D? 11.
What type of circuit is A?
12.
What type of circuit is C?
13 .
What is wrong with circuit B if it is meant to light up the two bulbs?
Look at the circuit opposite. Decide which of the switches A to E correctly answer questions 14 to 17 14.
Which switch controls all the bulbs?
15.
Which switch controls only bulb 1?
16.
Which switch controls only bulb 3?
17.
Which switch controls bulbs 2 and 3 but not bulb 1?
A
B
C
E D
Look at the diagram below before answering questions 18 to 19. 18. If the wire was replaced with 50 cm of the same wire, what would happen to the brightness of the bulb? 19. If the original wire was replaced with thicker wire of the same material and same length, what would happen to the brightness of the bulb? 20. 21. 22. 23. 24. 25. 26. 27.
100cm of thin copper wire
Draw a circuit to show: two cells, a switch and two lamps all connected in series. If one lamp 'blows' in the circuit you have drawn what will happen to the other lamp? Explain your answer to question 21 If you connect another lamp in the series circuit, what happens to the brightness of all the lamps? Explain your answer to question 23 Draw a circuit to show: two cells, a switch and two lamps. Show the lamps connected in parallel. If one lamp 'blows' what will happen to the other lamp in the parallel circuit? Explain your answer to question 26
Explaining electricity can be helped by imagining water flowing around pipes. For questions 28 to 30 match up which of the electrical devices in the left hand list is like which object on the right hand list. 28. The thin filament wire inside a bulb 29. The battery
30. A switch
A: A clamp that squeezes the hose pipe B: A part of a hose pipe that is much thinner than the rest of the hose pipe. C: A water pump that makes the water flow through a hose.
Well done! Now go back and check your work to make sure you haven’t made any silly mistakes.
Look at diagrams A to D to answer questions 1 to 6. 10
In which of the
circuits above are the bulbs brightest? A, B, C or D? 11.
What type of circuit is A?
12.
What type of circuit is C?
13 .
What is wrong with circuit B if it is meant to light up the two bulbs?
Look at the circuit opposite. Decide which of the switches A to E correctly answer questions 14 to 17 14.
Which switch controls all the bulbs?
15.
Which switch controls only bulb 1?
16.
Which switch controls only bulb 3?
17.
Which switch controls bulbs 2 and 3 but not bulb 1?
A
B
C
E D
Look at the diagram below before answering questions 18 to 19. 18. If the wire was replaced with 50 cm of the same wire, what would happen to the brightness of the bulb? 19. If the original wire was replaced with thicker wire of the same material and same length, what would happen to the brightness of the bulb? 20. 21. 22. 23. 24. 25. 26. 27.
100cm of thin copper wire
Draw a circuit to show: two cells, a switch and two lamps all connected in series. If one lamp 'blows' in the circuit you have drawn what will happen to the other lamp? Explain your answer to question 21 If you connect another lamp in the series circuit, what happens to the brightness of all the lamps? Explain your answer to question 23 Draw a circuit to show: two cells, a switch and two lamps. Show the lamps connected in parallel. If one lamp 'blows' what will happen to the other lamp in the parallel circuit? Explain your answer to question 26
Explaining electricity can be helped by imagining water flowing around pipes. For questions 28 to 30 match up which of the electrical devices in the left hand list is like which object on the right hand list. 28. The thin filament wire inside a bulb 29. The battery
30. A switch
A: A clamp that squeezes the hose pipe B: A part of a hose pipe that is much thinner than the rest of the hose pipe. C: A water pump that makes the water flow through a hose.
Well done! Now go back and check your work to make sure you haven’t made any silly mistakes.
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