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Why is the gradient on a current-potential difference graph not the resistance?
Wiki User
∙ 13y ago
Resistance is defined by R = V/I where V is potential difference and I is current.
It is not: change in pd / change in current - which would be the gradient of the curve.
Thus to measure the resistance at a particular pd we simply read off the current at that pd and use the equation above.
The problem stems from the way resistors are introduced before non-ohmic components, and for ohmic components it may appear that the gradient is being used for the resistance.
Wiki User
∙ 13y ago
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resistance of a material
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the gradient of the graph
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What is the significance of the slope on a distance vs time graph?
The gradient of that line will be the speed of the object, because the gradient is the difference in y over the difference in x, while the speed is the difference in distance over the difference in time.
What does the slope of a graph potential difference vs current represent?
resistance of a material
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The answer depends on what the graph is of!
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the gradient of the graph
How do you plot ohms law graph of potential difference versus current?
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The gradient of a distance-time graph gives the object's speed.
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It is the downward gradient of the graph.
What equal accleration on a speed vs time graph?
The gradient of the graph.
Can the scale of a graph affect the gradient calculation?
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How does the graph vary between voltage and current?
If the graph is for Ohmic components e.g resistor or wires -Constant gradient -V is proportional to I The second graph is for Non-Ohmic components e.g Filament lamps/diodes -(v is NOT proportional to I) -Gradient is high at the origin (0,0) and low at the top due to an increase in resistance Hope this helps!! I couldn't put the pictures on, but just google a Filament lamp graph and they will come up :)
What is a vertical change in relation to slope?
Gradient (on a graph as I assume you mean), or the differential of the line's equation (dy/dx which means "the difference in y with respect to a difference in x").
What feature of a distance per time graph represents speed?
The gradient (slope) of the tangent to the graph at the given time - provided that it exists. If the graph is a straight line at that point, it is the gradient of that line.
