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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 www.pixl.org.uk The PiXL Club Ltd, Company number 07321607 © Copyright The PiXL Club Ltd, 2016

Required practical – exam boards AQA Edexcel OCR

Practical procedure: I V characteristics Video 1 Video 2 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.

Possible examination style questions Draw an I-V graph for a fixed resistor at a constant temperature. Describe the relationship in the graph drawn for Q.1. Describe and explain how the I-V graph for a lamp differs from the diagram drawn for Q.1. Draw the I-V graph for a diode. Explain why its shape differs from that of the lamp.

Possible examination style questions answers Draw an I-V graph for a fixed resistor at a constant temperature. ANSWER:

Possible examination style questions answers Describe the relationship in the graph drawn for Q.1. ANSWER: Linear relationship Directly proportional Ohmic conductor Constant resistance

Possible examination style questions answers Describe and explain how the I-V graph for a lamp differs from the diagram drawn for Q.1. ANSWER: Non linear; not proportional; non-ohmic (accept correctly drawn graph) Heating element that gets hot Temperature change causes the lamp to be non-ohmic Resistance increases as the temperature increases

Possible examination style questions answers Draw the I-V graph for a diode. Explain why its shape differs from that of the lamp. ANSWER: Diodes only allow current to flow in one direction

Key questions: What are the circuit symbols for diode, bulb, resistor, thermistor, variable resistor, LDR What does the term ‘linear’ mean? Is this a linear or non-linear relationship? What does the term ‘directly proportional’ mean? Is the relationship directly proportional? What is a diode? What is meant by the term ‘non-ohmic resistor’? Name a non-ohmic resistor. Draw an I-V graph for this non-ohmic resistor. How would you find the resistance from the gradient of an I-V graph?

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