ice-water bath? 16. II In a laboratory experiment, you vary the current through
ID: 779213 • Letter: I
Question
ice-water bath? 16. II In a laboratory experiment, you vary the current through an objet and measure the resulting potential difference across it in each case Figure 19.48 shows a graph of this potential V as a function of the current I. (a) Does Ohm's law apply to this object? Why do you sa so? (b) How is the resistance of the object related to the slope of the graph? Show why. (c) Use the slope of the graph to find the resis tance of the object. V (volts) 0.60 0.40 0.20 I (mA) O 1.0 2.0 3.0 4.0 A FIGURE 19.48 Problem 16.
Explanation / Answer
a)
Since the given graph is linear therefore ohm's law is applicable to given object
Ohm's law states that
The potential difference (voltage) across an ideal conductor is proportional to the current through it.
since the graph is linear therefore Voltage is directly proportional ti current across the object
b)
Slope of the graph is equal to the resistance of the object
c)
R = (0.6 - 0.2)/(4e-3-1.5e-3) = 160 ohms
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