1. Required Practical Guide
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Required Practical Guide
Physics
Resistance
This document contains:
Links to YouTube clips showing the practical procedure
Information from examination boards AQA, OCR, Edexcel
Potential examination questions and answers
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
Commissioned by The PiXL Club Ltd. November 2016
The PiXL Club Ltd, Company number
© Copyright The PiXL Club Ltd, 2016

2. Required practical – exam boards
AQA
Edexcel
OCR

3. Practical procedure: Resistance
Video 1
Video 3
Click on each of the tabs to take you to a YouTube clip. Please note these are external sites to PiXL, PiXL does not control the content of these sites.
Video 2

4. Possible examination style questions
Design a practical to investigate the impact of wire length on resistance.
List the variables you will keep the same to ensure your data is valid.
Complete the following table by calculating the resistance:
What conclusions can you draw from this investigation?
How could you increase the validity of the data?
Length of wire/ cm
Current/ amps
Potential difference/ volts
Resistance/ ohms 10
0.24
0.47
1.96 40
0.11
0.68
6.18 70
0.06
0.82
13.67

5. Possible examination style questions answers
Design a practical to investigate the impact of wire length on resistance.
ANSWER:
Diagram of circuit e.g.
Ammeter in series, voltmeter in parallel
Powerpack/ battery – same voltage each time
Named length of wire
Reading current and p.d.
Calculate resistance V = IR
Repeat with different lengths

6. Possible examination style questions answers
List the variables you will keep the same to ensure your data is valid.
ANSWER:
Voltage from power pack/battery
Temperature – take the readings immediately
Repeats to reduce the impact of outliers
Same material of wire
Same diameter of wire

7. Possible examination style questions answers
Complete the following table by calculating the resistance:
ANSWER: V = IR Potential difference = current x resistance R = V/I Resistance = p.d. / current

8. Possible examination style questions answers
What conclusions can you draw from this investigation?
ANSWER:
Increasing length of wire increases the resistance
Electrons collide with ions more often

9. Possible examination style questions answers
How could you increase the validity of the data?
ANSWER:
Repeats of same wire length
Completing with more lengths of wire
Examples of lengths of wire given

10. Key questions:
What are the circuit symbols for the following components?: battery, switch, resistor, variable resistor, filament lamp, ammeter, voltmeter.
How is an ammeter connected into a circuit?
How is a voltmeter connected into a circuit?
How could you vary the current and potential difference in a circuit?
How do you calculate resistance using the current and potential difference?
Why does the brightness of the bulbs change when they are wired in parallel rather than series?
What does the term resistance mean?

11. Summary document
A summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. It includes practical methods and other potential examination questions