Physics Sec Sample Paper I Worksheet - University Of Malta, 2012 Page 6
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115.
The diagram shows a simple transformer.
Primary
Secondary
input supply
input coil
output coil
core
(a)
Circle the one of the following power supplies A, B or C, required for the
transformer to work.
AC supply
DC supply
A
B
C
(1)
Students performing an investigation on a transformer, recorded different values of
potential difference across its secondary and primary coils. They tabulated the results
as shown below.
o
p.d. across 2
coil / V
0
4.0
8.0
12.0
15.0
20.0
24.0
o
p.d. across 1
coil / V
0
0.5
1.0
1.5
2.0
2.5
3.0
o
o
(b)
Plot a graph of p.d. across 2
coil (y-axis) against p.d. across 1
coil (x-axis)
on the graph paper provided.
(4)
o
coil is incorrect.
(c)
One of the p.d. readings across the 2
(i)
On your graph, draw a circle around the incorrect value.
(1)
(ii)
From your graph or otherwise, determine the correct value.
_____________________________________________________________________
(1)
(d)
(i)
From your graph, find the potential difference across the secondary
coil when the potential difference across the primary coil is 0.75 V.
_____________________________________________________________________
(1)
(ii)
Calculate the number of turns of the secondary coil given that the
primary coil has 50 turns.
_____________________________________________________________________
_____________________________________________________________________
(2)
Page 6 of 11
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