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Core Concepts
Quick questions on System synthesis and the systems approach - WJEC A-Level Electronics
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 are interfacing between blocks?Show answer
The point where one block's output meets the next block's input is an interface, and a system only works if the blocks are compatible there. A comparator output that can supply only a few milliamps cannot directly drive a motor that needs an amp, so an interfacing block (a transistor switch or a relay driver) sits between them. Voltage levels, current capability and signal type (analogue or digital) must all match across an interface.
What is q1?Show answer
Draw a three-block diagram for an automatic night-light that switches an LED on when it gets dark. Name a device for each block. [3 marks]
What is q2?Show answer
Explain why an interfacing block is often needed between a logic processing stage and a motor. [2 marks]
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