Measuring the resistance of a resistor

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The discussion centers on determining the most precise method for measuring the resistance of a 5-ohm resistor. One method involves varying voltage and measuring current to calculate resistance, while the other uses a multimeter for direct measurement. Understanding how the multimeter operates is crucial for comparing the two methods effectively. The importance of showing calculations and work is emphasized for clarity. Ultimately, the precision of each method can be evaluated by considering the principles of Ohm's law and the multimeter's measurement technique.
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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.
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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