Investigating How the Length of a Wire Affects Its Resistance
Planning:
Risk Assessment:
* I will handle the power supply carefully.
* I am going to only use a maximum voltage of 2 volts.
* I will be careful when handling the mains equipment.
* I will make sure I have a clear space to work in and nothing on
the floor around me.
In this investigation, I will set up a simple circuit to be able to
read the voltage and current when the length of wire changes, so I
then can work out the resistance. I will be using constantan wire
starting of with 1m length and then decreasing it by 0.10m intervals
down to 0.20m long. I will not go above 1m or below 0.20m because it
may be too long that they resist so much current that the wire burns,
or the length of the wire is so small that it doesn't resist any
current at all. The length of the wire will be changed by moving the
crocodile clip across the wire on a ruler. The independent variable
will be the length of the wire because that is what I will be
changing. The dependant variable will be the resistance because it
will change only due to the length of wire.
The circuit should be set up as in the circuit diagram below. It is
important that the voltmeter is set up in parallel and the ammeter in
series.
Battery[IMAGE]Circuit Diagram:
I will work out from the readings of the voltmeter and ammeter the
resistance in the circuit. This can be done using the formula:
R=V/I Where R= Resistance, V= voltage, I= Current.
This means I can find and record the resistance. This will work out
the resistance in ohms.
Equipment:
* Power supply
* Constantan Wire 1m
* Voltmeter
* Ammeter
* Metre ruler
I also decided to use a wooden block to keep hold of the wire, because
and displayed in SWG. I will be using copper wire of 14, 18, 22, 26
have to be across the wire and not just anywhere in the circuit so it
there will be. So if the length of the wire were to double, so would
V is voltage in volts and I is current in amperes. L:- is the length
The Resistance of a Wire Investigation Aim: To investigate how changing the length of a wire affects the resistance. Prediction: I predict that the longer the piece of wire, the greater the resistance will be. This is because the current is resisted by the atoms in the wire. In a longer piece of wire, there would be more atoms for the electrons to collide with and so the resistance would be greater. The shorter piece of wire will have less resistance because their will be less particles causing less collision.
50cm for us. The current will be kept on the same level using the same
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With any large structure, a major question on everyone's mind is "is it safe?" For something like a several
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This means that I expect a graph of R versus L to be of the form:
Investigating the Relationship Between the Length of a Wire and Its Resistance Aim: To find the relationship between the length of a wire and it’s resistance. Planning: We conducted a preliminary experiment to help us conduct the real experiment. In this preliminary experiment we aimed to find out what thickness and type of wire would be suitable for the experiment, and what range of lengths of wire and range of voltages and currents would be suitable for measuring. We discovered that at too great a voltages and too short a length, the wire became very hot. One time it melted, in a way similar to a fuse, because of the hot temperature, but this was only when we tested a length of 2cm.
of the atoms, so if there are more or larger atoms then there must be