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Current-voltage characteristics and non-ohmic components

Electricity · Lesson 4 of 5

Lesson 4 of 5

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Lesson 4 of 5 · Electricity

Current-voltage characteristics and non-ohmic components

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By the end you’ll be able to

describe an ohmic conductor as one that obeys Ohm’s law at constant temperature and identify a straight-line current-potential difference relationship through the origin
interpret and sketch current-potential difference graphs for a fixed resistor, filament lamp, diode and thermistor or light-dependent resistor where specified
explain why the resistance of a filament lamp increases as temperature increases

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explain how the resistance of a thermistor changes with temperature and how the resistance of a light-dependent resistor changes with light intensity

compare ohmic and non-ohmic behaviour using graph shape, gradient and operating conditions

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