Why is my calculated resistance higher than the resistor used

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SUMMARY

The discussion centers on the discrepancy between the calculated total resistance in a DC series circuit and the actual resistance of a 100Ω resistor. The user measured the resistor's value at 97Ω using a digital multimeter (DMM) but calculated total resistances of 114.9Ω and 113.63Ω at 1.0V and 2.0V, respectively. The conversation highlights the potential impact of measurement errors, including the resistance of the DMM and connections, on the total resistance calculations. The consensus is that added resistance from the DMM and other components in the circuit can lead to higher calculated resistance values.

PREREQUISITES
  • Understanding of Ohm's Law (R=V/I)
  • Familiarity with digital multimeters (DMM) for measuring voltage and current
  • Knowledge of series circuit configurations
  • Basic concepts of electrical resistance and tolerance ratings of resistors
NEXT STEPS
  • Investigate the impact of DMM internal resistance on circuit measurements
  • Learn about resistor tolerance and its effect on circuit performance
  • Explore methods for minimizing measurement errors in electrical circuits
  • Study the principles of ideal vs. non-ideal meters in circuit analysis
USEFUL FOR

Electronics students, hobbyists, and professionals involved in circuit design and analysis, particularly those working with resistors and measurement tools.

  • #61
gneill said:
Remember when I asked whether or not your DMM had different places to plug the leads into it for different types of readings or ranges? Sometimes it's easy to forget to change or select the right plug positions.
Yeah, now I understand, the wires I used were placed in the right sockets I'm pretty sure.
 

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