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OHM's prac report

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Introduction

Aim: To investigate OHM'S Law. Hypothesis: It is expected that as the resistance increases the current will decrease. Introduction: OHM'S Law states that the current passing through a conductor between two points is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them. The mathematical equation that describes this relationship is: Independent Variable: changing the resistance (OHM'S) Dependant Variable: The current (A) is decreased because of the increasing resistors. Constant: The voltage is kept constant but is changed at the end of each test to make the investigation more accurate. Materials: Method: 1. Collect materials listed in above diagram 2. Set up apparatus shown above 3. Set the voltmeter to 1 volts and place the lead in the 5 OHM's resistor 4. ...read more.

Middle

13 2.200 1.280 0.730 0.230 2.270 1.280 0.720 0.230 2.280 1.280 0.730 0.240 15 2.450 1.400 0.800 0.250 2.600 1.480 0.840 0.270 2.620 1.480 0.840 0.270 Analysis: Averages Volts 5 OHM's 10 OHM's 18 OHM's 56 OHM's 1 0.170 0.095 0.054 0.017 3 0.511 0.291 0.166 0.054 5 0.855 0.482 0.278 0.089 7 1.196 0.678 0.389 0.125 9 1.531 0.870 0.498 0.160 11 1.871 1.060 0.611 0.196 13 2.250 1.280 0.727 0.233 15 2.557 1.453 0.827 0.263 It can be seen from the Graph that as the volts increased and so did the resistors, the current was recorded lower that the previous. The highest current recorded was, 2.557amps with a resistance of 5 OHM's and a voltage of 15 volts. The lowest current recorded was, 0.017amps with a resistance of 56 OHM's and a voltage of 1. ...read more.

Conclusion

The Equipment should be checked prior to the practical to reduce errors during the experiment. Also introducing more accurate results by recording the results ten times, instead of five, and work out the average. Use digital ammeters to measure the current. Compare the results to other practicals that were conducted and compare views and data. The Results: It can be seen from the Graph that as the volts increased and so did the resistors, the current was recorded lower that the previous. The highest current recorded was, 2.557amps with a resistance of 5 OHM's and a voltage of 15 volts. The lowest current recorded was, 0.017amps with a resistance of 56 OHM's and a voltage of 1. This shows that as the resistors increased the current was weaker, than of a low resistor at the same voltage. Conclusion: The Hypothesis is correct, as the volts and the resistance was increased, the current decreased. ?? ?? ?? ?? ...read more.

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