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AS Physics G482
DC Circuits
Making circuits
You are to make and draw the following circuits, remembering to record all voltage and
current readings.
a) A series circuit containing: a bulb, an ammeter and a voltmeter
b) A parallel circuit containing: a bulb, an ammeter and 2 voltmeters.
c)
d)
e) From these circuits what can you now say about current and voltage in series and parallel
circuits.
Look at the following circuits. For each one list the components, describe what they could be used for:
AS Physics G482
DC Circuits
Questions
1. (a)
In order to carry out an investigation to determine the I-V characteristic of an LED
a student connects the circuit shown in the figure below.
10 Ω
A
6.0 V
B
On the figure above add an LED with a 100  resistor in series, an ammeter and a
voltmeter to complete the circuit between terminals A and B.
[3]
2.) Below shows a temperature sensing potential divider circuit where this thermistor
may be connected, between terminals A and B, in series with a resistor .
A
6.0 V d.c.
B
resistor
Fig. 1
(i)
Draw the circuit symbol for a thermistor on Fig. 1 in the space between
terminals A and B.
[1]
(ii)
A voltmeter is to be connected to the circuit to indicate an increasing p.d.
when the thermistor detects an increasing temperature. On Fig. 2, draw the
circuit connections for a voltmeter to measure a p.d. that rises with
increasing temperature.
[1]
3.) The figure below shows an incomplete circuit with a battery and a resistance wire made of
a material of resistivity ρ.
resistance wire
(a)
Complete the circuit of the figure and show how you would connect suitable
meters to determine the current in the resistance wire and the potential difference
across the resistance wire.
[2]
AS Physics G482
DC Circuits
4) The figure below shows an electrical circuit.
X
light
The battery has negligible internal resistance.
(i)
Name the component X.
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[1]
Extension:
5) The figure below shows an electrical circuit.
4.5 V
s1
12 
8.0 
s2
4W
resistance wire
The battery has e.m.f. 4.5 V and has negligible internal resistance. The resistance wire
–8 2
m .
(i)
Suggest how you can arrange switches S1 and S2 (e.g. opened or closed) so that
the circuit has a total resistance of 12 Ω. Show calculations.
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[3]