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# Joules law

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Introduction

Aysweria Naathan IB HL Physics Y2 04-November-2007 Joule's Law Aim: To determine the accuracy of Joule's law in determining the resistance of a circuit. Data Collection: Time (s 0.1)* Energy (mili-joules0.05) Energy (joules0.00005) 0 0 0 5 1.15 0.00115 10 2.33 0.00233 15 3.35 0.00335 20 4.37 0.00437 25 5.41 0.00541 30 6.43 0.00643 35 7.47 0.00747 40 8.48 0.00848 45 9.53 0.00953 50 10.59 0.01059 55 11.59 0.01159 60 12.53 0.01253 * Data collected with video analysis Data Analysis: Calculated Resistance (R) ...read more.

Middle

The calculated resistance is almost twice the magnitude of the stated resistance. One major random error is that the copper wires are not perfect conductors thus resistance is higher than the stated. Moreover, the copper wire might have oxidized to form CuO which is a good insulator in its solid state. A human error is that I may have torn some of the copper rods inside the wire as I had done in another set up. ...read more.

Conclusion

Another major random error is that Energy measuring machine is not resistance free. Thus it too adds to the error. We should find the resistance of the machine prior to the experiment and subtract it out from the total. Lastly, a less major error is that we assumed that the variable resistance has a resistance of exactly 47000 ohms. The resistance may well be 47000 ohms but it is likely to be a off. Thus I suggest that the experiment is repeated with different instrument but at the same settings to either support or contradict this result. ...read more.

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