Investigating Resistance In a Wire
Plan
In this investigation I will find out how a piece of wire of different
material would affect the resistance in a series circuit. To test if
this will work I will use certain equipment such as a power supply Box
which will supply my energy which I will need. I will also use a
voltmeter and an ammeter to test for my resistance. The relationship
between Current, Voltage and resistance can be given by the Ohms Law
to which is shown by the diagram below:
[IMAGE]This means Voltage (V) = Current (I) x Resistance (R). To use
this formula I will need wires such as Nickel Chrome, Manganin,
Copper, and Constantan.
From my scientific knowledge I know that long wires have more
resistance than shorter wires and that thicker wire have more
resistance than thinner wires.
Preliminary work
Before my actual investigation, I done a short experiment to help with
the real investigation I used the wire name Nickel Chrome and the
thickness 24 SWG. My results are shown below:
Length (cm)
Current (A)
Voltage (V)
Resistance (Ω)
20 cm
2.20
2.00
0.90
30 cm
1 .66
2.20
1.32
40 cm
1.30
2.40
1.84
50 cm
1.10
2.50
2.27
60 cm
0.93
2.50
2.68
70 cm
1.81
2.60
1.43
80 cm
0.73
2.70
3.69
90 cm
0.66
2.70
4.09
100 cm
0.59
2.70
4.57
From my Preliminary work I learnt that:
· As you increase the length of the wire the resistance increases too
· The wires can get hot during the test
· To set-up the circuit every time can be difficult
Method
I will use an electronic Ammeter, which I will use to test for my
I also decided to use a wooden block to keep hold of the wire, because
longer it will take electrons to get to the end of the wire. This is
From this I can tell I can use 3 volts and resistance wire that is
Measuring the Resistivity of a Wire Aim The aim of this experiment is to find out how the area of the cross section of the wire affects the resistance and also to find out the resistivity of the wire having found the resistance over a certain length and using a certain cross sectional area. I will also experiment to see how the length of the wire affects the resistance. Plan The first thing that I will do is to set up the apparatus as shown. below. The.. A, V Except for the experiment where I alter the length, I will keep the length of the wire constant throughout the experiments and only change.
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
It is also relevant to know of Ohm’s Law, which states that the current through a metallic conductor (e.g. wire) at a constant temperature is proportional to the potential difference (voltage). Therefore V ¸ I is constant. This means that the resistance of a metallic conductor is constant providing that the temperature also remains constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher temperatures, the particles of the conductor are moving around more quickly, thus increasing the likelihood of collisions with the free electrons.
Factors Affecting the Resistance of a Wire The aim of this experiment is to investigate one factor that affect the resistance of a wire. I will do this by performing an experiment. First I will need to identify the factors that effect resistance. There are a few factors that affect the resistance, it is determined by the properties an object has.
Investigating how the Resistance of a Constantin Wire is Affected by Its Length. Introduction: In this experiment we will be investigating how change is made. the length of a piece of Constantin wire will affect the resistance.
2) Cut a length of wire over a meter long and sellotape to a meter
Investigating the Effect the Thickness of a Wire has on Its Resistance. Equipment:.. Nickel Wire cut into 10 pieces of 30cm length (Ruler, Pliers). Two crocodile clips Five Pieces of Wire Power Source Variable Resistor Ammeter Volt Meter Method: The.. =
The objective of this study is to evaluate the effects of wire length and temperature of wire on electrical conductivity and resistivity.