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GCSE Design and Technology · key term
The rate of flow of electric charge through a circuit. Its symbol is and its unit is the ampere (A), often called the amp.
Used by Edexcel and Eduqas
Specification 5.5.2 · Paper 1
Revise: Electrical Units and Resistance CalculationsAn electronic system needs suitable resistor values to control the current through its components. Three electrical quantities help you choose those values.
Component 1
The rate of flow of electric charge, measured in amperes (A).
For a series current-limiting resistor, use the voltage across the resistor, not automatically the whole supply voltage.
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The driver matters because a sensing unit often cannot supply enough current to operate an output directly. It allows a relatively small control signal to control the current needed by the output. Recognising that need is part of designing the system, even before choosing the detailed processing circuit.
