Physics Secondary School Annual Examinations Form 5 - Directorate For Quality And Standards In Education, 2011 Page 10
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118.
This question is about the relationship between current and voltage for an
unknown resistor R
David and Charlene set up the circuit using the apparatus shown below to investigate
the effect on the size of current through an unknown resistor R as the voltage across R is
changed.
A
R
V
a.
4
Label the four items indicated by an arrow in the circuit.
b.
Name the apparatus which:
i.
1
shows the size of the current flowing through the resistor R, _______________
ii.
1
is used to change the voltage across the resistor R, ______
_________
iii.
shows the size of the potenti
al difference (voltage) across resistor R, _______________.
1
c.
Plot a graph of current I (y-axis) against voltage V (x-axis) using the ta
ble of results
below completed by David and Charlene.
I /Amps
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
V / Volts
0
1
2
3
4
5
6
7
5
d.
From yo
ur graph d ermi
et
ne
the s e of t :
iz
he
i.
1
current flowing through the
resistor when the voltage
acr
oss
it is 5 V.
3.
_____
ii.
1
voltage across the resisto
r when the current flowing through it 0.45 A.
_____
R =
V
e
.
.
1
Calculate the resistance of the resistor R using the formula
I
Page 10 of 11
Physics – Secondary School – Form 5 - 2011
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