Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 10
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1211.
This question is about Ohm’s Law
a.
Complete the following:
Ohm’s Law states that _________________________________________________________
___________________________________________________________________________
(3)
b.
Malcolm and Simone set up an experiment to investigate whether a filament lamp obeys
Ohm’s law. Electrical components K and M are left out as shown below.
• •
A
K
M
i.
Label K and M
V
___________________________________________________________________________
(2)
ii.
Draw the electrical components K and M in their correct positions in the circuit.
(2)
iii.
How is the variable resistor used in this experiment?
___________________________________________________________________________
(2)
c.
Malcolm and Simone plot the points on a graph grid as shown below.
i.
Draw the best smooth graph through the
plotted points on the graph grid.
(1)
(1)
Use the graph to determine the:
ii.
current flowing through the filament
lamp when the p.d. across it is 5 V,
______
(1)
(1)
iii.
p.d. across the filament lamp when a
current of 1.7 A is flowing through it.
______
(1)
(1)
iv.
resistance of the filament lamp at a p.d.
of 6 Volts.
___________________________________________________________________________
(2)
v.
Does the filament lamp obey Ohm’s law?
________________
(1)
vi.
Which feature of the graph supports your answer to question c (v)?
__________________________________________________________________________
(2)
Physics – Secondary Schools – Track 3 - Form 5 – 2013
Page 10 of 12
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