2214 Words9 Pages

Investigating the Resistance of a Wire
Planning
--------
Aim
The aim of my investigation is to investigate how length affects the
resistance of a wire. Resistance is the force, which opposes the flow
of an electric current around a circuit so that energy is required to
push the charged particles around the circuit. Resistance is measured
in ohms. Resistance occurs when the electrons travelling along the
wire collide with the atoms of the wire. These collisions slow down
the flow of electrons causing resistance. Resistance is a measure of
how hard it is to move the electrons through the wire.
Plan of the method to be used:- The resistivity of a wire can be
determined using the equation P= RA/L Where: R:- Is the resistance of
the wire in ohms and can be determined using the equation R=V/I where
V is voltage in volts and I is current in amperes. L:- is the length
of the wire used in metres. A: - Is the cross-sectional area of the
wire in metres square and can be determined using the equation A=
Ï€(d/2 x10 Â³)Â² where d is the diameter of the wire in mm. I will plot a
graph of length on the x-axis against resistance on the y-axis. From
the relation R = PL /A which corresponds to the straight line equation
y=mx+c the graph should be a straight line passing through the origin
where m is the gradient of the straight line graph that corresponds to
P/A. Since the cross-sectional area of the wire can be found by
measuring its diameter. Therefore the resistivity of the wire can be
calculated.
Apparatus list:-
t Battery 1.5V
t Switch
t Metre Rule
t Voltmeter
t Ammeter
t Wire 100cm (under test)
t Crocodile clips
t Connecting wires
t Micrometer
t Sellotape
Apparatus
Range
Sensitivity
Metre Rule
0-100 cm
0.1 cm
Micrometer
0-25 mm

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