Physics – 4.2.3 Electromotive force and potential difference | e-Consult
4.2.3 Electromotive force and potential difference (1 questions)
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Analogue Voltmeters:
- Advantages:
- Easy to read – the voltage is directly indicated by the position of the needle.
- Generally less expensive than digital voltmeters.
- Do not require a power source.
- Disadvantages:
- Less accurate than digital voltmeters – reading the needle requires some interpretation.
- Can be susceptible to parallax error (reading the needle at an incorrect angle).
- May require periodic calibration.
Digital Voltmeters:
- Advantages:
- More accurate – the voltage is displayed numerically.
- Easy to read – the voltage is clearly displayed on a screen.
- Often have features such as auto-ranging and hold functions.
- Disadvantages:
- Generally more expensive than analogue voltmeters.
- Require a power source (battery).
Comparison Table:
| Feature | Analogue | Digital |
| Accuracy | Lower | Higher |
| Ease of Reading | Easy | Very Easy |
| Cost | Lower | Higher |
| Power Requirement | None | Required |