Exam-style question
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Compare analogue and digital signals. Explain how the way each signal changes distinguishes one from the other.
Model answer
What a good answer should say
- An analogue signal changes continuously.
- Its value can move smoothly through a range of possible values.
- A digital signal changes between separate, distinct levels.
- Therefore, the main difference is that an analogue signal is continuous, whereas a digital signal is represented by discrete levels.
Explanation
Why this works
The response should focus on signals rather than data: continuous change describes an analogue signal, while separate levels describe a digital signal. It should not rely on confusing the terms data and signal.
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