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?

1 2 3 4

0% 0%0%0%

Response Grid

2. What do these symbols show?

1 2 3 4

0% 0%0%0%

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?

1 2 3 4

0% 0%0%0%

1. an ammeter 2. a cell3. a motor 4. a voltmeter

Response Grid

4. How big would the current be at X, Y and Z?

1 2 3 4

0% 0%0%0%

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:

1 2 3 4

0% 0%0%0%

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:

1 2 3 4

0% 0%0%0%

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:

1 2 3 4

0% 0%0%0%

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:

1 2 3 4

0% 0%0%0%

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?

1 2 3 4

0% 0%0%0%

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?

1 2 3 4

0% 0%0%0%

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:

1 2 3 4

0% 0%0%0%

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.

1 2 3 4

0% 0%0%0%

Response Grid

13. When current flows through wires:

1 2 3 4

0% 0%0%0%

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:

1 2 3 4

0% 0%0%0%

Response Grid

15. An electric heater has a current of 10 A flowing through it. Which fuse should be used?

1 2 3 4

0% 0%0%0%

1. 3 A2. 5 A3. 13 A4. 30 A

Response Grid

16. A fuse is used to:

1 2 3 4

0% 0%0%0%

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:

1 2 3 4

0% 0%0%0%

1. blood2. bones.3. nerves4. skin.

Response Grid

18. If you touch electrical equipment with wet hands:

1 2 3 4

0% 0%0%0%

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?

1 2 3 4

0% 0%0%0%

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?

1 2 3 4

0% 0%0%0%

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