graph between terminal potential difference V …
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Sia ? 4 years, 3 months ago
A student measures the terminal potential difference (V) of a cell ( of emf E and internal resistance r) as a function of the current (I) flowing through it.
To find the slope and intercept of the graph between V and I
The general equation of EMF in cell:
V = E − ir
⟹ V = E + i(−r)
Compare it with standard equation of the line:
y = mx + c
⟹ y = c + mx
Since graph of student is V vs I
∴ V is y and I is x
Therefore, E is intercept and (−r) is slope
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