Multimeter values different and fluctuations

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Discussion Overview

The discussion revolves around the discrepancies observed when measuring current in a circuit, particularly focusing on the fluctuations in multimeter readings and the differences between theoretical and practical values. The context includes practical circuit measurements, potential short circuits, and the configuration of components on a breadboard.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant reports significant fluctuations in multimeter readings and discrepancies from theoretical values, suggesting that short circuits and compact wiring may be contributing factors.
  • Another participant requests a detailed circuit diagram and component descriptions to better understand the situation, indicating that the initial description lacks clarity.
  • Concerns are raised about the lack of information regarding where the multimeter was connected and the specifics of the circuit configuration, with one participant noting a contradiction in the description of the circuit type (parallel vs. single).
  • A participant points out a specific short circuit occurrence between two resistors, indicating a potential source of error in the measurements.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are multiple competing views regarding the circuit configuration and the causes of measurement discrepancies. The discussion remains unresolved with ongoing requests for clarification.

Contextual Notes

Limitations include a lack of detailed circuit diagrams, unclear descriptions of component connections, and unresolved issues regarding the nature of the circuit (parallel vs. single). The impact of short circuits on measurements is also not fully explored.

lee123456789
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I measured current through a parrallel circuit and my multimeter fluctuated massively and compared to theoretical values they are miles out. multimeter was changed over to ampmeter. I used duel power supply. Throughtout the measuring i kept getting short circuits. The circuit on the breadboard was compact and resistors kept touching and leads kept touching other resistors.

would this of accounted for the massive difference between theory values and practical as well as the fluctuation on the scale?
What are possible causes of low current and fluctuation?
 
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With such a vague description of what you are doing, it's hard to say. How about an exact circuit diagram with descriptions of the components.
 
phinds said:
With such a vague description of what you are doing, it's hard to say. How about an exact circuit diagram with descriptions of the components.
digrAM.png

multimeter
resistors
wires
duel power supply
 
I see no indication of where the meter was hooked up and no indication of where shorts occurred.

Also, you originally said a parallel circuit but I see no parallel circuit here.
 
phinds said:
I see no indication of where the meter was hooked up and no indication of where shorts occurred.

Also, you originally said a parallel circuit but I see no parallel circuit here.
connected to the 33omh resistor and shot occurred between the 33 and 15 path.
sorry meant single
 

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