1.Plastic is a conductor because it lets a current flow through it. 2.Plastic is an insulator...
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Transcript of 1.Plastic is a conductor because it lets a current flow through it. 2.Plastic is an insulator...
7J Electrical Circuits
1. Plastic is a conductor because it lets a current flow through it.
2. Plastic is an insulator because it lets a current flow through it.
3. Metals are conductors because they let a current flow through them.
4. Metals are insulators because they let a current flow through them.
1. Which of these statements is true?
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Response Grid
2. What do these symbols show?
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1. a cell and a bulb2. a cell and a switch3. a bulb and a switch4. a switch and a motor
Response Grid
3. Which instrument would you use tomeasure current?
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1. an ammeter 2. a cell3. a motor 4. a voltmeter
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4. How big would the current be at X, Y and Z?
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1. It would be biggest at X and smallest at Z.
2. It would be biggest at Z and smallest at X.
3. There would be no current at Y.4. It would be the same at all three
places.
Response Grid
5. You can make the current in a circuit smaller by:
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1. putting a switch in the circuit.2. putting more bulbs in the circuit.3. taking some bulbs out of the
circuit.4. putting more cells in the circuit.
Response Grid
6. Resistance is a way of saying:
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1. how much current is flowing.2. how hard it is for a current to
flow.3. how many cells are in a circuit.4. how many switches are in a
circuit.
Response Grid
7. Current is:
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1. a source of energy.2. a kind of liquid inside the wires.3. tiny particles called electrons
flowing through the wires.4. tiny particles called atoms
flowing through the wires.
Response Grid
8. A long wire:
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1. has a smaller resistance than a short wire.2. has the same resistance as a short wire.3. has a bigger resistance than a short wire.4. does not have resistance.
Response Grid
9. Which of these circuits are parallel circuits?
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1. X and Y only2. X and Z only3. Y and Z only4. all of them
Response Grid
10. Which switches must be pressed to make bulb X come on?
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1. 1 and 2 only2. 1 and 3 only3. 2 and 3 only4. all three of them
Response Grid
11. Parallel circuits are used for house lights:
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1. so they can all be switched on and off together.
2. so you know when one breaks, because all the others go off.
3. so they use a bigger current.4. so they can all be switched on
and off separately.
Response Grid
12. Which of these statements is not true? (assuming identical components)
1. The currents at Q and R add up to give the current at S.
2. The current is the same at P and S.3. The current is the same at Q and R.4. The current is the same at P and Q.
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13. When current flows through wires:
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1. they melt.2. they get cold.3. they get hot.4. nothing changes.
Response Grid
1. a metal strip that bends when it is hot.2. a piece of wire that melts when it gets
too hot.3. a piece of plastic that does not let
current through.4. the part of a plug that sticks into a
socket.
14. A fuse is:
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Response Grid
15. An electric heater has a current of 10 A flowing through it. Which fuse should be used?
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1. 3 A2. 5 A3. 13 A4. 30 A
Response Grid
16. A fuse is used to:
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1. heat things.2. make things move.3. control the temperature of
something.4. stop current flowing if
something is wrong.
Response Grid
17. Messages are carried in our bodies by:
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1. blood2. bones.3. nerves4. skin.
Response Grid
18. If you touch electrical equipment with wet hands:
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1. you might damage the equipment.2. you could get an electrical shock.3. you might get your hands dirty.4. you might make the equipment dirty.
Response Grid
19. What happens if a large electrical current flows through your body?
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1. Your heart could stop working.2. Your eyeballs could explode.3. Nothing at all.4. It will improve your circulation.
Response Grid
20. What is a pacemaker?
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1. An electrical device that keeps the heart beating regularly.
2. Someone who helps you run at the right speed in a race.
3. A machine to measure the length of your stride.
4. A computer game.
Response Grid
Participant Scores16 Olamide Sholotan16 Oliver Tate16 Ziad Dakhil16 Clara Sanchez-Cane16 Nicole Eulderink