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```End of Unit Test
7J
Name
7
J
Class
1 What do each of these symbols represent? Write the names under the symbols.
[3 marks]
2
A
a Why is there no reading on the meter in this circuit?
b Which of these materials could you put in the gap to make the bulb light up?
Tick the correct boxes.
copper
glass
aluminium
wood
iron
plastic
[3 marks]
3 What is an ammeter used for?
[1 mark]
4
a What happens if you close switch 1?
3
A
B
C
2
b Which switches must you close to make
bulb B light?
1
[2 marks]
Page 1 of 3
Exploring Science for QCA
Copymaster File 7
436
© Pearson Education Limited 2002
7J
End of Unit Test (continued)
5
A4
A1
A3
7
J
A7
A5
A2
A6
Circuit X
Circuit Y
All the bulbs in Circuits X and Y are the same. Complete the table below.
Circuit X
Ammeter
Reading
A1
A2
0.2 A
Circuit Y
A3
A4
A5
0.4 A
A6
A7
[3 marks]
6 Write a sentence to describe what current is.
[2 marks]
7
The current is 0.4 A and the bulb in this circuit is bright.
0.4 A A
a What will happen to the brightness of the bulb if you put another bulb in
series in the circuit?
b What will the current be in the circuit when there are two bulbs in series?
[2 marks]
Page 2 of 3
Exploring Science for QCA
Copymaster File 7
437
© Pearson Education Limited 2002
7J
End of Unit Test (continued)
8 Which piece of wire would have the lowest resistance? Tick the correct box.
a long, thick wire
a long, thin wire
a short, thick wire
a short, thin wire
[1 mark]
9 Jenny measured the current in a thin wire, then she
repeated her experiment with a thick wire. This graph
shows her results.
B
current
7
J
a Which was the thick wire?
A
b Explain how you worked out your answer.
voltage
[3 marks]
10 Electricity can be dangerous. Describe two things that an electrical shock can do to
your body.
[2 marks]
11 Why can you safely touch a 12 V electricity supply, but not a 230 V mains supply?
Use the word resistance in your answer.
[3 marks]
Page 3 of 3
Exploring Science for QCA
Copymaster File 7
438
© Pearson Education Limited 2002
```
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