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GCSE: Electricity and Magnetism

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  • Marked by Teachers essays 19
  • Peer Reviewed essays 18
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  5. 21
  1. Marked by a teacher

    Ohm's Law coursework

    4 star(s)

    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. The variables in this investigation are: - The length of the wire - The cross-sectional area of the wire - The material of the wire - The temperature of the wire Input: * The length of wire.

    • Word count: 1989
  2. Marked by a teacher

    Resistivity Coursework

    4 star(s)

    Constants are current (I), cross sectional area of wire (A) Resistivity (?) and temperature of the Nichrome wire. An R against L graph must look like this, (look below,) if resistance and length are directly proportional to each other. A4c: Detailed Plan * confirm power supply unit is at 0v * construct apparatus as illustrated in diagram * connect voltmeter negative crocodile clip on 0.100m * increase current to 0.30A * take reading from voltmeter as quickly as possible for the wire to remain at the same * switch off power when entering the reading into required data * connect the voltmeter negative crocodile clip to increased 0.200m * repeat process till I reach 1.000m * repeat the whole process again but with 0.60A * plot a graph of R vs.

    • Word count: 1532
  3. Marked by a teacher

    Thermal insulators.

    4 star(s)

    Which means that I need something that is a bad thermal conductor (good thermal insulator) to keep the amount of conduction to a bare minimum? Plan I am planning to test five materials (paper, cling film, cloth, bubble wrap and plastic) and one control, three times and find the average (to ensure accuracy). Whichever material changes the temp of the water the least is the best insulator. I will wrap them around a 200ml beaker (no lid) and fill it with 200ml of boiling water.

    • Word count: 1014
  4. Marked by a teacher

    Factors Affecting The Resistance Of A Metal Wire.

    4 star(s)

    Preliminary Work 4. Copper wire - 0.247mm diameter Length Current (A) Voltage (V) Resistance (?) 10cm 0.400 0.150 0.375 60cm 0.370 0.100 0.270 Nichrome wire - 0.247mm diameter Length Current (A) Voltage (V) Resistance (?) 10cm 0.300 0.630 2.100 60cm 0.190 1.130 5.947 Nichrome wire - 0.457mm diameter Length Current (A) Voltage (V) Resistance (?) 10cm 0.380 0.140 0.395 60cm 0.290 0.600 2.000 From the results, it can be seen that the nichrome wire with a diameter of 0.247mm had the greatest variation within the results, so this wire will be used.

    • Word count: 1870
  5. Peer reviewed

    Aim: The aim of this experiment is to see how the length of a nichrome wire affects its resistance.

    4 star(s)

    If there are more collisions that means there is more resistance. Example: If there are 10 free electrons and have to go through 2 wires: a)10 cm and b)20 cm, there will be more resistance in wire b) as there will be more molecules in the electron's path in wire b) than in wire a). Aim: The aim of this experiment is to see how the length of a nichrome wire affects its resistance. Hypothesis: Resistance is caused by the collision of free electrons the fixed particles of the metal and its impurities therefore if the length of the wire is doubled; the electrons collide with twice as many molecules thereby doubling the resistance.

    • Word count: 1048
  6. Peer reviewed

    What factors affect the resistance of Ni-Chrome wire?

    4 star(s)

    This was also show within my preliminary results as increased the amount of filament bulbs (in affect increasing the amount of wire) the resistance increased. Resistance: x = length of wire x = R = V/0.25 0.25 = Amps 2x = 2R = 2V/0.25 V = Volts 3x = 3R = 3V/0.25 R = resistance 4x = 4R = 4V/0.25 As you can see I think that as you double the length of wire the resistance also doubles, because of this the voltage must double as it is being divided by a constant and it must double so the resistance can double.

    • Word count: 1967
  7. Free essay

    Resistance of a Wire

    4 star(s)

    Results Plan The heading for my results table will be 'dial voltage', 'actual voltage', 'length of wire', 'current', and 'resistance'. To ensure a fair test I will make sure that the dependent variable will be the same through out the experiment. Safety I will assure that when I conduct my experiment, I will have a clear space between me and other students. I will use a heat proof mat to be the base of the wires so it will not heat up.

    • Word count: 1183
  8. Peer reviewed

    Resistance of a Wire

    4 star(s)

    In a thin wire there is less space, but more resistance and in a long wire there is more space, yet less resistance. The flow of electrons: Hypothesis: Before I do my experiment I predict that the resistance in the wire will increase as the length of the wire increases. I also predict that if the resistance in the wire increases, then the thickness of the wire will decrease. My diagram of my circuit: For my first investigation task I will be doing a preliminary test to find out which are the best wires to use for my investigation.

    • Word count: 1189
  9. Peer reviewed

    To investigate How the Length of Wire affects its Resistance.

    4 star(s)

    Method 1. I will set up the apparatus as shown in the circuit. 2. I will get a wire of length 20cm and connect it to a wooden ruler. 3. The first crocodile clip will be connected to the wire at 0cm. 4. The second crocodile clip will be placed at the relevant length to which I am finding out the necessary information. 5. The power supply will be turned. 6. I will the read the readings from the Volt Meter and Ammeter.

    • Word count: 1015
  10. Peer reviewed

    An investigation into the effect of temperature on a squash ball

    4 star(s)

    To judge how high the ball has bounced, I will be using my eyesight. Diagram Equipment list 4 different coloured squash balls Beaker Water bath 2, 1 meter rulers MDF Kettle Ice Thermometer Stopwatch Tongs I did a preliminary experiment to see if my method would work and if there were any problems with the way I will conduct my experiment. Preliminary Results Temperature (�C) Distanced Bounced (Cm) 90 81 40 68 0 20 Factors affecting my experiment * If I use different squash balls of different elasticity it will affect the bounciness of the ball.

    • Word count: 1111
  11. Peer reviewed

    "Making an Electromagnet"

    3 star(s)

    The next thing that the proponents did was to remove some insulation. So a pair of scissor or a cutter was used in order to remove the insulating rubber starting from each end of the wire to expose the copper wire. The wire was wrapped around the nail in a spiral manner. The proponents left enough of the wire unwound so that it can be attached to the battery. The wire was wrapped only in one direction, but with many layers.

    • Word count: 1186
  12. Experiment plan. The aim of this experiment is to investigate how the resistance of a piece of wire depends on its length, as Ohms law states.

    Electrical resistance in this model The flowing electrons have to get past the positive ions in circuit, the electrons bump into the positive ions which slows them down, a reduced speed of electrons means a reduced current and a higher resistance The effect of raised temperature on resistance in this model Raised temperature on resistance in this model makes positive ions vibrate more, which will then mean more collisions between electrons and positive ions this will also means less gaps between positive ions to pass through.

    • Word count: 1460
  13. Free essay

    Resistance of a wire investigation.

    3 Wires with crocodile clips either side Without wires there would be no connection between the wires, batteries, ammeter and Voltage meter. Ammeter Records the result of the current so I'll have to use this to record. Voltage meter Records the result of the voltage so I'll have to use this to record. Piece of wire (E.g. 30 cm Copper with a weight of 26swg) This is the main piece of the experiment as you need the material to record the result.

    • Word count: 1653
  14. Coursework for physics - resistance of a wire

    It takes a short time for these electrons to collide all the way along the wire. If you add more wire, it will take longer for the current to flow through the wire. This is because there are more ions in the wire resulting in it being harder for the current to flow through an extended wire. Pre-test Equipment: * Battery pack-This will be used to supply power for the experiment/circuit * Leads-These connect up the components in the circuit * Constantan wire-this is our independent variable * Copper wire- this is our independent variable * Nichrome wire- this is our independent variable * Volt meter-This measures the volts in the circuit * Ammeter-This measures the

    • Word count: 1979
  15. Free essay

    The aim of this experiment is to find out how the length of a piece of wire affects its resistance.

    Copper is usually chosen for electrical wiring because it allows the flow of current and has low resistance. Procedure: We started out with a length of wire, stretching and measuring it along a meter ruler. We attached both ends of the wires connecting to an ammeter and a battery. We will be using an Ammeter to measure the amount of current flowing from the mains, which is in this case around 0.19A, we will be using a Voltmeter to measure the amount of current flowing through the wire, we will be using a Variable Resistor to keep the resistance of the circuit constant in order to keep the Ammeter from reading either higher then 1.0A and/or lower then 0.1A.

    • Word count: 1815
  16. Resistance in a wire - investigate whether or not the length of a piece of a wire affects the resistance

    This means that I can be more confident in my results because I will know that the differing current will not affect my resistance. Also, in order to get a more varied range and more reliable results I will go from 10cm of wire to 50cm. Equipment * Lead x6 * Crocodile Clips x2 * Variable Resistor x1 * Metre Ruler x1 * Power Pack x1 * 1m Nichrome wire - 32 swag x1 * Ammeter x1 * Voltmeter x1 * Calculator x1 * Cello-tape x1 Lead - To create the circuit with and to keep it complete in order to carry out the experiment.

    • Word count: 1236
  17. How does the length of a wire affect its resistance?

    For example, it would be very difficult to keep the temperature of the wire constant. This is because the wire heats up the longer it is in use, and it would also be difficult to measure the actual temperature of the wire. I thought number of components would take a lot longer to set up, needing more and more wires in the circuit. Type of wire is a discreet variable, so I could not identify a proportional relationship, meaning no line graph in my conclusion.

    • Word count: 1744
  18. The aim of this investigation is to find out how the resistance of a wire is affected by its lengths. I will do this by changing its lengths and working out each lengths potential difference and current.

    The independent variable will be the length of the wires as we are trying to find out its affects on the resistance. The independent variable affects the dependant variable as in that when you change the independent variable the value of the dependant variable will change. The dependant variable in this case would be the resistance of the wires and it will change as the length of the wire changes. Hypothesis: I think that the resistance of the wire will be higher when it is longer.

    • Word count: 1011
  19. How have electronic devices changed our world?

    The truth is that most of us would be terrified at the prospect of living without these luxuries as they do massively reduce human effort, but what happens when the envelope is pushed and machines step over the line. Technology is all around us and has been developed for our benefit. For instance, people wanted an easy form of communication, the telephone was invented. People needed information fast, thus was created the internet. The fact is that technology had made us who we are today, some argue it has made us lazy as everything we do has something in one

    • Word count: 1735
  20. I am going to build a sensor for a vehicle fuel gauge. It will sense how much petrol or water there is in the tank.

    I also had to replace some of the equipment which were damaged and made the results inaccurate. This sensor is used in transports such as cars, motorcycles, trucks etc. and is a very important component. Without it the driver would not know how much fuel is left in the tank. It works by having a float or something similar attached to a rod, and the other side of the rod is attached to a rotary potentiometer. As the float moves up or down with the amount of fuel, the rod will be twisting with it, and so will the rotary potentiometer, and this will produce a voltage which will indicate the fuel level in the tank.

    • Word count: 1715
  21. How temperature affects resistance on a piece of wire

    I have certain hypothesis of how temperature affects resistance (ii) I have chosen enameled copper wire as I will be using long lengths I do not want to short circuit the wire when they are wrapped hence the enamel. I chose copper because it is meant to be used as an electrical conductor (e.g. wire) compared to nichrome wire which is for use for heating elements (this would affect temperature and make my investigation un reliable) and constantan which is used for making resistors (heat doesn't change its resistance much)

    • Word count: 1658
  22. Physics ball bearing investiagtion

    Making sure you apply no pressure when dropping the ball bearing, to make it as fair as possible. Repeat this 3 times for 10 different heights in my case (3 x 10cm, 3 x 20cm, 3 x 30 cm, 3 x 40cm, 3 x 50cm, 3 x 60cm, 3 x 70cm, 3 x 80cm, 3 x 90cm, 3 x 100cm)

    • Word count: 1644
  23. A hydrogen Vehicle

    However unfortunately there is no readily available source of molecular hydrogen (H2) to be found on our planet. There is lots of hydrogen, but it is found as part of larger molecules, most commonly water or hydrocarbons. To be able to use hydrogen in a fuel cell, those hydrogen atoms must be stripped from hydrocarbons and reformed into H2 or electrically disassociated from oxygen in water. This is factual as hydrogen gas like helium gas just floats off into space as it is lighter than the gases that make up the air.

    • Word count: 1481
  24. Free essay

    The resistance of a piece of wire is dependent on its temperature, length, cross-sectional area and the type of metal the wire is made of.

    The free electrons are given energy and as a result move and collide with neighbouring free electrons. This happens across the length of the wire and thus electricity is conducted. Resistance is the result of energy loss as heat. It involves collisions between the free electrons and the fixed particles of the metal, other free electrons and impurities. These collisions convert some of the energy that the free electrons are carrying into heat. Resistance is usually given the symbol 'R'. The unit for electrical resistance is the ohm. Ohm's law is the voltage drop (V) across a resistor proportional to the current running through it.

    • Word count: 1391
  25. Resistance of a Wire

    Diameter (swg) Voltage across the wire (V) Material of Wire Current (Amps) Resistance (?) 90 90 90 90 90 34 34 34 34 34 0.63 (2) 2.41 (4) 4.08 (6) 6.00 (8) 7.80 (10) Constantan Constantan Constantan Constantan Constantan 0.06 0.24 0.42 0.62 0.80 0.37 2.17 9.71 9.70 9.75 80 70 60 50 40 34 34 34 34 34 4.05 (6) 4.04 (6) 4.01 (6) 3.98 (6) 3.83 (6) Constantan Constantan Constantan Constantan Constantan 0.47 0.53 0.60 0.74 0.91 8.62 7.62 6.68 5.38 4.21 100 100 100 36 32 20 3.20 (6)

    • Word count: 1622

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