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Investigate and measure the resistance in nichrome wire of different thickness, used in the circuit.

Extracts from this document...

Introduction

Affects on Resistance Investigation.

Aim: To investigate and measure the resistance in nichrome wire of different thickness, used in the circuit.

Resistance is something that slows down the flow of electrons in the circuit.

“The greater the resistance the more voltage is needed to push a current through the wire”

Therefore the resistance of a wire is calculated by:

image00.png

The four main factors, which affect resistance, are resistance are thickness, length, conductors and temperature.

A thin wire has more resistance than a thick wire. So as the thickness increases the resistance decreases.

As cross sectional area increases, the resistance decreases” (PFY)

So by doubling the wire, the resistance becomes weaker, as it has two paths for the electrons to flow through. My preliminary experiment shows that the thicker the wire the more current goes through it. This is because the electrons have a larger travelling path. In thin wires the electrons have smaller space to flow, therefore the resistance is higher.

A longer wire has more resistance than a shorter wire, so therefore as stated in PFY book “As the length of the wire increases, the resistance increases”

This means that as the length of the wire increases, it resists the flow in the circuit, therefore the resistance increases.

Conductors play an important role in resistance. Conductors, which are poor, have more resistance. A preliminary experiment of conductors and resistance showed us that a good conductor has less resistance than a poor conductor like nichrome.

...read more.

Middle

image26.png

Fair test:

To make this experiment a fair test the power pack will be kept at the same voltage (6V), the length of the connecting wires will be kept the same and the ammeter and voltmeter will be kept in the same place. The positions of the reading on the rheostat will be kept the same (5cm apart) this is because the readings would be more accurate.

Accuracy: I will be repeating the whole experiment twice and will record the results in a results table. To get the readings accurate, I found out the averages between the 4 different rheostat positions for each layer. I then repeated the experiment, found out the averages of the positions again, and them found the final averages between the averages of the two experiments.

Safety: I will be careful and insuring that no water will be in contact with the apparatus (circuit)

...read more.

Conclusion

Investigations that I may carry out related to resistance, are the other factors, which effect resistance.

I would carry out an investigation of how the length of nichrome wire would affect resistance. I would do this by placing different sized nichrome wire into a similar circuit to this investigation and would record and analyse the results, and to see if there are any other patterns or trends that I could identify. I would also like to see whether or not the results of my experiment would obey the scientific theory of the effect of the size and resistance. The science theory of effect of size on resistance is “As the length of the wire increases, the resistance increases.” (PFY)

By Kajal Patel 10mh

Preliminary experiment.

Aim: To find out a material to use for the resistance investigation

Prediction: I think that the nichrome wire will be the best material to use for the investigation.

Apparatus: Power pack, ammeter, connecting wires, nichrome and copper wire.

Method: We connected the circuit with an ammeter. We replaced a gap with different types of wire, of the same length, and two thicknesses. We then read the readings of amps on the ammeter, and recoreded them in a table.

Diagram:image31.png

Results:

Material

Thin/Thick

Current

Nichrome

Thin

0.5

Nichrome

Thick

0.8

Copper

Thin

1.3

Copper

Thick

1.8

Conclusion:

From my results, I conclude that nichrome is a better resistor than copper, and therefore it would be ideal for me to use nichrome in the investigation. Copper allowed more current to pass through, and so was less resistant than the nichrome, as it resisted the flow of electrons.

...read more.

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