This question is for Physics. The voltage is on the y axis and the current is on the x axis. Which method do you think gives more accurate result? Finding the gradient or calculating the resistance of a component by using one set of readings, e.g current 0.48 and voltage is 5 How do you calculate the resistance of a component by finding the gradient of the line of best fit?
resistance = voltage divided by current calculation is bestHow do you calculate the resistance of a component by finding the gradient of the line of best fit?
The component may not have uniform linear resistance-voltage or resistance-current relationship.
For example, a wire with a current flowing through it may have one resistance, but if you increase the current, you may induce a temperature rise in the wire, thus the resistance increases.
I would use the line of best fit, unless your results have an obvious trend, but be aware of the above!
If you were just using 1 reading why would you have a graph. Use the line of best fit and get the gradient.
V=IR
Therefore R=V/I which is also the gradient of your graph (y over x)
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