Electronics > Beginners

relationship between V, I and R in graphical terms

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brownt:
I can't make sense of this graph


I understand the in written terms as in proportionality and the inverse. But I can't see how the graph relates. Can someone explain it please.

agehall:
U=R*I

If U is constant, you get something like above. If R is high, I needs to be lower and vice versa.

IanB:
The graph is incorrect in showing a linear relationship. Therefore it cannot be explained.

Nitrousoxide:
Usually, you will have Voltage on the x-axis (dependent variable) and current on the Y axis (independent variable) and R is the "controlled variable". But this does depend on device/experimental setup

So you will have:
V = I*R
R = V/I (can be seen as dV/dI or gradient).

Alternatively you can switch the axies, that case the gradient will be 1/R.

brownt:
I see. well that's good.

What about these graphs then. I think the first one makes sense, but the other one does not?

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