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Resistor Investigation

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Introduction

Gunjan Jain

11D - Science

MYP Y11 Science – Resistor Investigation

Planning:

Introduction:

Resistance is simply the force, which opposes the flow of electrons through an electrical conductor. In a circuit the free electrons cannot always keep moving at the same speed all through out the circuit. This force is known as resistance, which can also be defined as the property of an electrical conductor to work against the flow of current and thus changing some of the electrical energy into heat. The resistance of a specific object can be determined by several factors such as:

  • Length of the Wire
  • Thickness/Width of the Wire
  • Material of the Wire
  • Temperature
  • EMF Supply
  • Wire Density

In this Investigation I would be testing only one variable/factor from the above list, which is the length of the wire.

Aim:

To find out how resistance of a wire is affected by different lengths.

Hypothesis:

        I think that as the length of the wire increases the amount of resistance will also increase in proportion to the length. This is quite obvious because as the size of the resistor increases the amount of atoms will also increase in proportion. Hence the current flowing through will have to flow through a greater number of atoms in a longer wire compared to a shorter wire.

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Middle

0

10

1.3

3

0.433

15

1.5

2.2

0.682

20

1.7

1.9

0.895

25

1.8

1.56

1.154

30

1.9

1.3

1.462

35

1.96

1.2

1.633

40

2

1.1

1.818

45

2.07

1

2.07

50

2.1

0.9

2.333

Data Analysis:

Analysis of Results:

image00.png

Conclusion:

        As can be seen from the graph and the results it is easy to conclude that my hypothesis that the longer the wire the higher the resistance was correct. The Length of the nichrome wire and the resistance are both directly proportional to each other. As the length increases the resistance will also increase. This can be seen clearly from the graph above. Firstly the graph has a steady straight best-fit line, secondly the best-fit line is going through the origin and thirdly all the points are near the best-fit line. Thus this clearly shows that when one is doubled the other also doubles. There are several examples of this in my results table. For example if we take 10 cm and 20 cm example. The resistance at 10cm is 0.433 and at 20cm the resistance is 0.895. If we are doubling the length from 10 to 20 the resistance can be seen doubled also.

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Conclusion

(for error 4) Ask the teacher to check the circuit, and after changing each length, check whether the circuit is in place correctly.(for error 5) Keep the voltage lower, and rather than keeping the power pack on for a long time, quickly turn it on, and take the readings off the ammeter and voltmeter. (for error 6) Ask the teacher if the school as electrical ammeter and voltmeter. This would give better and accurate results.

Errors 2 cannot be improved upon as taking accurate readings off non-electrical ammeters and voltmeters is not possible. Error 3 cannot be improved upon also because crocodile clips keep moving and thus keeping an eye on them always is not possible. The improvements written above are suggestions only, but not 100% guarantee that after improving on the errors, the results will be 100% accurate. Not all errors can be fixed upon 100% as there is always a chance that human error will occur.

        The experiment can be extended in the possible ways:

  • Looking at other variables as written below
  1. Length of the Wire
  2. Thickness/Width of the Wire
  3. Material of the Wire
  4. Temperature
  5. EMF Supply
  6. Wire Density
  • Perform the experiment with each wire several times. Then averaging the results out would give more accurate results.
  • Getting results for different wire lengths like 100 cm.

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...read more.

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