Measuring the resistance of a resistor

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SUMMARY

The discussion focuses on measuring the resistance of a 5-ohm resistor using two methods: varying voltage and measuring current versus direct measurement with a multimeter. The first method involves applying voltages between 5V and 10V, measuring the resulting current, and calculating resistance using Ohm's law. The second method entails removing the resistor from the circuit and measuring resistance directly with a multimeter. It is concluded that the direct measurement method with a multimeter typically provides greater precision for small resistances.

PREREQUISITES
  • Understanding of Ohm's Law
  • Familiarity with multimeter operation
  • Basic knowledge of electrical circuits
  • Concept of averaging measurements
NEXT STEPS
  • Research the specifications and measurement techniques of digital multimeters
  • Learn about the limitations of voltage and current measurement methods
  • Explore advanced techniques for measuring low resistances, such as four-wire sensing
  • Study the impact of temperature and connection quality on resistance measurements
USEFUL FOR

Students in electrical engineering, hobbyists working with circuits, and anyone interested in improving their precision in measuring small resistances.

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Homework Statement


Its a general question asking which method of measuring resistance (a 5 ohm resistor in a simple circuit) has greatest precision. The first method I varied voltage from about 5V to 10V, then measured the current each time, then averaged that current and calculated resistance. The other method was remove resistor from circuit then direct measurement of the resistance using multi meter.
The question asks "Which method of measuring the resistance of small resistances is capable of greater precision?"
I am not really understanding what is being asked ..thanks for any help

Homework Equations

The Attempt at a Solution

 
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To understand what is being asked, you first need to do some research and figure out how the multimeter that you used measures the resistance that you connect to it. Then you need to compare its method with yours. I can already see a problem with your method. Think how resistance is defined by Ohm's law.

For future reference: Please show your work and calculations. Merely talking about them is not sufficient.
 

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