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# Investigation to find out the resistance of an unknown resistor.

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Introduction

Investigation to find out the resistance of an unknown resistor Theory Factors which effect resistance � The diameter of the wire- the wider the wire the less resistance(decreases current) The diameter of the wire will make a difference as the thicker the wire, the easier the current will be able to pass through it, as there is more room within the wire. � The length of the wire- the longer the wire (i.e. the more coils) the greater the resistance. There will be more atoms for the current to pass through so there will be more resistance in the wire. � The material which the wire is made out if- some materials have higher resistance than others e.g. ...read more.

Middle

Check that ammeter and voltmeter are both zeroed 2. Start with a simple circuit. The battery pack The Unknown Resistor The Variable resistor The Ammeter which must be placed in series The Voltmeter must be place in parallel with the resistor Checking all components work 3. Fill a 250ml beaker with 150ml of tap water, which the unknown resistor is then placed in. Also put a thermometer in the beaker take make sure the temperature is kept a constant as possible. 4. Take accurate readings of the current in Amps by changing the variable resistor. Before taking the readings record the temperature. 5. Do this when the ammeter is at 0.3, 0.5, 0.7, 1.1,1.3,1.5,1.7 amps. (Work this out by working out the maximum amp reading and the minimum reading then divide in to equal amounts depending on how many different readings you want to take.) ...read more.

Conclusion

E.g. when the Ammeter reads 0.3 the Voltage reads to and when the Ammeter reads 1.7 the voltage is 10. Looking at Graph A you can see that there is a good positive correlation between Current and Potential Difference. On my graph the line of best-fit shows that the Potential Difference is proportional to current. All point are relatively close to the Line Of best Fit. Evaluation I think that my results were quite accurate, as there weren't any anomalous points. If I were to repeat the experiment I think I could improve my results even more by: � I would take a much wider range of readings. � I would take more readings so that a more accurate average can be taken. ...read more.

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