P2 5
Exam-style questions
Name:
Class:
Current electricity
1
In a circuit diagram, symbols are used to represent different components.
Complete the table below. The first line has been done for you.
Symbol
2
Component
What the component does
ammeter
Measures the current in a circuit
voltmeter
a)
b)
Supplies energy to a circuit
c)
diode
d)
e)
f)
Varies resistance as the temperature varies
g)
h)
A student sets up a circuit to investigate how the potential difference across a filament lamp
varies with the current through it.
(a) How can the student vary the current through the lamp?
..........................................................................................................................................
(1)
(b) (i) Copy the axes below and sketch the shape of the graph the student would expect to
obtain.
(2)
(ii) Explain the shape of the graph you have drawn.
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AQA Science © Nelson Thornes Ltd 2006
P2 5
(2)
1
P2 5
Exam-style questions
Continued …
(iii) What do we call the line drawn through points on a graph plotted from experimental data
which smooths out variations in measurements?
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3
(1)
The diagram shows an electric circuit.
(a) Calculate the total resistance in the circuit.
..........................................................................................................................................
(1)
(b) What is the current through the 4 Ω resistor?
..........................................................................................................................................
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(3)
(c) What is the potential difference across the 4 Ω resistor?
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AQA Science © Nelson Thornes Ltd 2006
P2 5
(2)
2