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Northern IrelandTechnology and DesignQuick questions
AS 1 Electronic and Microelectronic Systems
Quick questions on Output subsystems and transducer drivers: LEDs, relays, motors and current limiting - CCEA A-Level Technology and Design
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is q1?Show answer
An LED (forward voltage 2.0 V, current 10 mA) runs from a 5 V supply. Find the series resistor. [2 marks]
What is q2?Show answer
State two reasons a relay is used to switch a mains load from a low-voltage circuit. [2 marks]
What is q3?Show answer
Why does an LED need a series resistor? [1 mark]
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