Electrical Engineering › Section D · Parallel and series-parallel circuits › Topic D.5
Voltmeter loading effects
A voltmeter is connected in parallel with whatever it measures, so it always becomes part of the circuit. Knowing when that changes the reading, and how to measure and troubleshoot parallel circuits, separates a trustworthy measurement from a misleading one.
In this topic
- Every meter joins the circuit
- Why the reading drops
- Ohms-per-volt ratings
- Worked example: measuring a high-resistance divider
- How big a meter resistance is enough
- Measuring a parallel circuit
- Worked example: troubleshooting a divider
- Parallel wiring in cars and computers
- Switches in house wiring
- Common mistakes to avoid
- Key takeaways
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