Investigating the Relationship Between the Length and Resistance of a Wire

Investigating the Relationship Between the Length and Resistance of a Wire

I am going to investigate to see if the change in the length of a wire

will affect the size of a current

My prediction

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I predict that the longer the wire is the higher the resistance This

is because there are free moving electrons being resisted by the atoms

in the wire, which is converting electric energy to heat energy. So if

the wire is longer there’ll be more electrons to collide with therefor

the resistance will double.

MY INVESTIGATION

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To do my investigation I will need some set of apparatus, which are

· Voltmeter to measure the potential difference

· Ammeter to measure the current

· Wire to run the current through

· Variable resistor to control the resistance

· 1 meter ruler to measure the length of the wire

The length of the wires, which I am going to use in this investigation

are

· 50cm

· 60cm

· 70cm

· 80cm

· 90m

· 1m

When investigating the wires I will have to repeat my experiment 6

times after that I will then set up my circuit, which will look like

this

[IMAGE]

[IMAGE]

[IMAGE]I understand that the electrons in the wire will lose some of

its energy when they are collide with. So for this I will have to keep

the voltage low to minimize the resistance. This is due to the kinetic

theory the more voltage, the hotter the wire the faster moving

particles therefor more energy is lost through collisions. This is due

to the principle of free moving electrons.

METHOD

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In this investigation my circuit will be set up to read the voltage

and current through the change in the wire. In my circuit my voltage

will be set up in a parallel and my ammeter will be in a series this

is because if the ammeter was set in series all the amps would have to