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12 Marking Scheme: Worksheet (AS) : R I V R

The document contains a marking scheme for a worksheet with multiple choice and short answer physics questions. It provides the answers and marks awarded for each question, along with explanations for some answers.

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Ruby Chong
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713 views1 page

12 Marking Scheme: Worksheet (AS) : R I V R

The document contains a marking scheme for a worksheet with multiple choice and short answer physics questions. It provides the answers and marks awarded for each question, along with explanations for some answers.

Uploaded by

Ruby Chong
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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12 Marking scheme: Worksheet (AS)

1 B [1]
2 D [1]
3 B [1]
4 C [1]
5 C [1]

6 a The current is not directly proportional to the p.d., therefore it does not obey Ohm’s law. [1]
b V  4.0 V and I = 60 mA [1]
V
R= [1]
I
4.0
R= ≈ 67  [1]
0.060
c The resistance of the lamp increases as the current increases. [1]
V
7 a R= [1]
I
12.0
R= = 150  [1]
0.080
b The resistance of the thermistor is higher at a lower temperature. [1]
1
Since R = , the graph is a straight line of smaller gradient. [1]
gradient of line

L d 2
8 R=  and A = r2 = [1]
A 4
L 4 L
R=  [1]
A d 2

9 a L = 1.0 m, r = 1.5  10−4 m, R = 5.33  [1]


RA 5.33    (1.5  10 4 ) 2
=  [1]
L 1.0
 = 3.8 ´ 10−7  m ([1] for value, [1] for unit) [2]
b There is no change. [1]
The resistivity depends on the material and not on its dimensions. [1]

AS and A Level Physics Original material © Cambridge University Press 2010 1

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