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# GCSE: Electricity and Magnetism

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• Marked by Teachers essays 19
• Peer Reviewed essays 18
1. ## 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. ## 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. ## 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. ## 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. ## 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. ## 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. ## 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. ## 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. ## 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. ## 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 b***s 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 b***s of different elasticity it will affect the bounciness of the ball.

• Word count: 1111
11. ## "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