PH-1040

I–V characteristics

Physics · Secondary 4 · Hard · I–V characteristics

A student plots a graph of current

I

against potential difference

V

for a filament lamp and obtains a curve through the origin. She wants to see how the resistance of the filament changes as the lamp gets hotter. What should she examine on the graph?

How the ratio $V/I$ changes along the curve.
How the ratio $I/V$ changes along the curve.
How the gradient of the curve changes along the curve.
How the inverse of the gradient of the curve changes along the curve.

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