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GCSE Design and Technology · key term
A specified operating limit for a component, such as the maximum voltage or power it can safely withstand under stated conditions.
Used by Edexcel
Specification 5.2.5, 5.5.1 · Paper 1
Revise: Component Tolerances, Ratings and Resistor Colour CodesThree descriptions help you decide whether a component is suitable: its value, its tolerance and its rating.
A specified operating limit that a component must not exceed, such as a resistor’s maximum power dissipation.
Distinguish a component’s value from its rating: resistance in Ω is not the same as power rating in W.
Justify component selection by comparing its value, tolerance and rating with the circuit’s requirements.
Distinguish value, tolerance and rating: resistance in Ω, permitted variation in %, and safe power dissipation in W are different properties.
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