Practice Flashcards
Flip to reveal answersWhat should be drawn first on a circuit diagram?
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All 4 Flashcards — System diagrams
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Question
What should be drawn first on a circuit diagram?
Answer
The supply rails — positive at the top, 0 V at the bottom. Every branch then hangs between them, input on the left and output on the right.
Question
What does a dot at a wire crossing mean?
Answer
The wires are connected. Crossing without a dot means no connection.
Question
Why must a transistor have a base resistor?
Answer
Without it the base takes whatever current the previous stage can supply, risking the transistor and stopping a divider working as a divider.
Question
How is a relay drawn, and why?
Answer
Coil in the low-voltage circuit, contacts as a separate switch in the load circuit, joined only by a dashed line — which shows the two circuits are isolated.
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Full study notes for System diagrams
Topic 7.4 hub
Electronic systems applied
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