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Flip to reveal answersWhy are circuit symbols fixed by standard?
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All 4 Flashcards — Circuit diagrams
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Question
Why are circuit symbols fixed by standard?
Answer
So a circuit drawn in one country can be read in another by someone who does not speak the language. The diagram shows what is connected to what, not what the board looks like.
Question
How do you recognise a variable resistor, an LED and a relay?
Answer
A variable resistor is a resistor box with an arrow across it. An LED is a diode triangle-and-bar with arrows leaving it. A relay is a coil drawn beside a separate pair of contacts.
Question
What does a dot at a wire crossing mean?
Answer
The wires are connected. Wires crossing without a dot are not connected — missing this is the commonest way a circuit is misread.
Question
How should a circuit diagram be read?
Answer
As input, process, output. Find the supply rails, then the sensing chain, follow the signal to whatever decides, and end at the load the current finally does work in.
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Topic 3.4 hub
Electronic systems
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