Edexcel GCSE Design and Technology · 1DT0
Specification 5.2.5, 5.3.4 · Paper 1
Revise: Component Tolerances, Ratings and Resistor Colour CodesThe marked value is the nominal value. Manufacturing does not produce every component with exactly the same value, so the tolerance tells you the permitted variation. A rating describes an operating limit, such as how much power a resistor can safely dissipate.
- Revise: Cost Factors
The stated or target value of a component, such as the resistance printed on a resistor.