– 21 –
Determine the slopes of the graphs shown below.
k Back to Ohm’s Law
Getting back to Ohm’s Law, consider the relationship I = E/R. Compare this with the y = ax
proportional expression we discussed on the previous page.
If we substitute I for y and E for x, a becomes 1/R .
This results in the proportional expression I = 1/R E. If R is constant, then I is proportional
to E. In other words, doubling or tripling the voltage value also causes the current value to
double or triple.
Expression 1
4 = a 4
a = 1
Therefore: y = x
Expression 2
2 = a 3
a = 2 / 3
Therefore: y = 2x / 3
EE-2 Ohm’s Law
y
0123456 x7
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