Preview

Practical Investigation:Resistance in Wire

Good Essays
Open Document
Open Document
1390 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Practical Investigation:Resistance in Wire
G10 science
By Freya Li

Practical Investigation
Resistance in Wire
Aim:
To investigate if the length of wire affects its resistance and find out how the resistance changes when the length of wire increases.

Hypothesis:
My prediction is that as the length of wire increases, the resistance will also increase. This is because current is the flow of electrons in a circuit and voltage makes the electrons flow through the circuit. The electrons have to collide with the atoms in the wire, which makes the electrons harder to flow through the circuit. And there are more collisions between electrons and atoms, as the length of wire increases. The higher resistance means more voltage is needed to push the current through the wire.

Variables:
1. Independent:
The length of wire will be changed in the circuit by moving the crocodile clips. (Length: 15cm, 25cm, 35cm, 45cm, 55cm)

2. Dependent:
I will calculate the resistance by measuring the voltage, current and using ohm’s law. (R=v/I) The voltage and current will be measured at least 3 times by using the voltmeter and ammeter.

3. Controlled:
Controlled variables
How will it be achieved
The diameter of the wire
Choose the wires with same diameter
The type of wire
Use the same type of wires
The temperature of wire
Avoid connecting the circuit for long time

Method:
Equipment:
1 m nichrome wire (diameter 0.46mm)
1 Ammeter
1 Voltmeter
Power Pack
5 wires leads
2 crocodile clips
Meter ruler

Procedures:
1. Connect the power pack to the main power supply by putting the plug in the socket and switch it on at the socket. Make sure the switch of the power pack is turned off.
2. The apparatus is set up as shown in the diagram below, with the ammeter connected in the series and the voltmeter connected in the parallel.
3. A nichrome wire is attached to both end of a meter ruler and then it is attached to the circuit with crocodile clips.
4. The crocodile clips will be moved to different lengths, from 15cm to 55cm, going up

You May Also Find These Documents Helpful

  • Good Essays

    ECT-120

    • 1527 Words
    • 9 Pages

    Accomplish the following procedure to observe the operation of the circuit and to assist in…

    • 1527 Words
    • 9 Pages
    Good Essays
  • Good Essays

    Lab 18

    • 846 Words
    • 3 Pages

    7. Attach the negative black lead from the DMM to the negative terminal of the battery holder.…

    • 846 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Brandico Barr Module 3

    • 608 Words
    • 3 Pages

    3. Ohm's law is represented by the equation I = V/R. Explain how the current would change if the amount of resistance decreased and the voltage stayed the same. In accordance with the law, is resistance decreased and voltage stayed the same the current would increase. The increase is inversely proportional to the resistance.…

    • 608 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    ECT122 W2 ILab 3

    • 954 Words
    • 5 Pages

    11. Measure and record the current between the positive terminal of the power supply and the resistor. (Note: You must break the circuit and insert the handheld DMM.) __88µA______…

    • 954 Words
    • 5 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Hai by the Water 345

    • 634 Words
    • 3 Pages

    Suppose an electrical wire is replaced with one having every linear dimension doubled (i.e. the length and radius have twice their original values). Does the wire now have (a) more resistance than before, (b) less resistance, or (c) the same resistance?…

    • 634 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Lab of Electrolytes

    • 608 Words
    • 3 Pages

    3. Attach the wires to the carbon road that acts as electrodes, one for cathode one for anode.…

    • 608 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Selab Chemistry Lab

    • 263 Words
    • 2 Pages

    3. How will you compare the currents in the circuits in Figure 2-1 experimentally? What equipment will you use?…

    • 263 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Circuit 3

    • 721 Words
    • 2 Pages

    3. Ohm's law is represented by the equation I = V/R. Explain how the current would change if the amount of resistance decreased and the voltage stayed the same. Ohm’s law states current is dependent on voltage and resistance. As in any mathematical equation if we change one variable in the equation on one side and leave the other variable constant, the other side of the equation will change as well. In this case since current is equal to voltage divided by resistance. If we keep voltage the same and decrease the denominator (resistance) our resulting number will increase. Thus the current will increase. If we look at this from a physics stand point we can see that if we decrease the amount of resistance the electrons are faced with, then the electrons will feel the voltage more and thus they will flow at a faster rate.…

    • 721 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    Aim: To investigate the main problems with my main experiment and to see how to resolve these.…

    • 334 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Light Dependent Resistor

    • 826 Words
    • 4 Pages

    When light shines on a Light Dependent Resistor, electrons are released and the current can get larger. So as the light intensity increases, more electrons are released and the resistance decreases. As the light intensity decreases, less electrons are released and the resistance increases.…

    • 826 Words
    • 4 Pages
    Powerful Essays
  • Good Essays

    Electric Current

    • 746 Words
    • 3 Pages

    2. What does the Ammeter (on the left) measure? How is this shown in the sim?…

    • 746 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Wire Coursework

    • 591 Words
    • 3 Pages

    Resistance is the force that slows down the flow of electrons; this can be due to electrons colliding. The total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. This is also true for thickness of wire; the thinner the wire is the more resistance.…

    • 591 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Salt Water Energy

    • 321 Words
    • 2 Pages

    Strip the coating from each end of the wires and attach alligator clips to each. If desired, connect one color of alligator clips on each wire, so that one wire has two black ends and the other has two red ends.…

    • 321 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Resistance of Wire

    • 766 Words
    • 4 Pages

    Hypothesis: I think that the higher the cross sectional area, the lower the resistance in the conductor will be. This is because the Resistance in a metal conductor happens because as the electrons move through the material (once a voltage has been applied) they collide with the atoms in the material and as a result lose some of their energy. The idea of resistance is simply how difficult it is for the electrons to move through a material. The more difficult it is, the more energy they lose in the material on their travels.…

    • 766 Words
    • 4 Pages
    Good Essays