Electrical Engineering › Section D · Parallel and series-parallel circuits › Topic D.8
Meter design and grounding
With series and parallel circuits mastered, you can design an ammeter, a voltmeter and an ohmmeter from one small meter movement. The same reasoning explains grounding: why a ground reference matters, how a test lead can short out a circuit, and how a ground wire makes an appliance safe.
In this topic
- One movement, three instruments
- The d'Arsonval movement
- Ammeters: the shunt
- Worked example: a two-range ammeter
- Voltmeters: the multiplier
- Worked example: a two-range voltmeter
- The series ohmmeter
- Ground as a reference
- Worked example: a probe ground that shorts a resistor
- Ground wires and safety
- Common mistakes to avoid
- Key takeaways
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