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This lesson covers the current-voltage (I-V) characteristics of different components — as required by the Edexcel GCSE Physics specification (1PH0). You need to understand the I-V graphs for resistors, filament lamps and diodes, and know how the resistance of LDRs and thermistors changes. This includes the core practical on investigating I-V characteristics.
An I-V characteristic is a graph that shows how the current (I) through a component varies as the potential difference (V) across it changes. By studying the shape of the graph, you can understand how the component's resistance behaves.
From V = IR, we get R = V/I.
To investigate the I-V characteristics of a resistor, a filament lamp and a diode.
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