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Laboratory 2

# 5 0 05 1 15 2 25 3 35 vr v graph 1

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Unformatted text preview: d in series, the current flowing through them is the same. Graph 1 plots V against I. By Ohm’s law, the inverse of the slope of the graph is the resistance. Verifying Ohm's Law I (A) VS VR (V) 3.50E- 03 3.00E- 03 y = 0.001x - 4E- 06 2.50E- 03 I (A) 2.00E- 03 1.50E- 03 1.00E- 03 5.00E- 04 - 1 0.00E+00 - 0.5 0 0.5 1 1.5 2 2.5 3 3.5 VR (V) Graph 1. Current flowing through R (I) vs. potential difference across R (VR) , obeying Ohm’s law. Standard Coefficients Error Intercept 4E- 06 1E- 07 B 0.001 2E- 07 Table 1. Linear regression on Graph 1.We can see from the regression that the current flowing through a resistor has a positive linear relationship with the potential difference across it. I is directly proportional to V, because the straight line passes through the origin. From Graph 1 and its linear regression in Table 1, we calculate that R = 1000 ± 0.2Ω. To verify the method of combining resistors in parallel and series, we used 2 resistors of similar resistance (to the same power). We measured them individually followed by the 2 combinations. Table 2 shows the data. R...
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