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GCSE: Electricity and Magnetism
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This impedes electron movement. The higher the temperature the higher the resistance in the wire. How the length of the wire affects resistance Increasing the length is like increasing the number of resistors in series as each part of the wire has its own resistance. The longer the wire is the less the potential gradient. As the potential difference is directly proportional to the current flowing through the circuit, the current is also reduced. This means that the resistance of the wire is higher.
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To measure the potential difference across a component a voltmeter is used. A voltmeter is connected across a component. The idea is to measure the amount of energy passing the point before the component and then the amount of energy passing the point after the component. This allows the voltmeter to calculate the amount of energy being used by the component through simple subtraction. A voltmeter can only be connected in a circuit across a component because it is designed to measure the amount of energy being used up and components are the only parts of circuits in which energy is used up.
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Science Lab Report - How does the voltage of the battery powering the electromagnet affect the number of paper clips that are attracted to it?
However there is a limit to the voltage of the battery since if the voltage of the battery is too high, this may cause the copper coil and wires to overheat. (Electromagnetism and magnetism). Independent variable: The independent variable in this experiment is the voltage of the battery powering the electromagnet. This is because the voltage of the battery is the only thing we are going to change between the 5 trials of this experiment. Dependent variable: The dependent variable in this experiment is the number of paperclips the steel nail can attract when magnetised.
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V = I x R Where I = Current (amps) V = voltage (V) R = Resistance (?) This equation can be used to determine the electric current of the circuit and light bulb, given the voltage and resistance. Equipment * 4 x AA Switched Battery Enclosure * Multimeter * 3 x Torch Bulb * 4 x AA 1.5V Battery * Bakelite Bulb Holder * Wires Method Series Circuit 1. As shown in the diagram below, connect the wire to the bakelite bulb holder, while making sure that the bulb is screwed on. Macintosh HD:Users:TrixSwift:Desktop:Screen Shot 2013-10-20 at 6.20.18 PM.png 1. Using the multimeter measure the resistance of each bulb.
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Length ? When increasing the length of the wire, it increases the length of the path that the moving charges have to pass, so the charges are likely to face collisions with other atoms that are not moving. 4. Temperature of the wire ? Once increasing the temperature of the wire, it increases the resistance because the atoms of the wire gain more energy as it heats up. When the atoms heat up, they vibrate faster, causing more collisions, which then increase the amount of resistance.
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