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EnglandProduct Design and TechnologiesQuick questions
Systems and mechanisms
Quick questions on Electronic systems and components: inputs, process, outputs and Ohm's law - Edexcel A-Level Product Design
4short 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 are output components?Show answer
Outputs include LEDs (with a series resistor to limit current), lamps, buzzers and motors. A relay or transistor switches loads that need more current or a separate (for example mains) supply than the control circuit can provide, isolating the low-voltage electronics.
What is q1?Show answer
State what happens to the resistance of an LDR as the light level falls. [1 mark]
What is q2?Show answer
A resistor has V across it and carries mA. Calculate its resistance. [2 marks]
What is q3?Show answer
Explain why a relay or transistor is used to switch a motor from a sensor circuit. [2 marks]
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