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\nResistance | GCSE Physics | Doodle Science\n

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\n\nPublisher:\n\nDoodleScience\n\n\n
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\nFollow me! Doodle Science teaches you high school physics in a less boring way in almost no time! Script: An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the...\nFollow me! Doodle Science teaches you high school physics in a less boring way in almost no time! Script: An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance. The length of a wire and its thickness affect the resistance in the circuit. The longer the wire, the greater the resistance because electrons collide with ions more often. The resistance of a thin wire is greater than the resistance of a thick wire because thin wire has fewer electrons to carry the current. Resistance can be found by measuring the current flowing through it, and the voltage across it. The equation for resistance is R = V/I where R is measured in Ohms, V in Volts and I in Amps. We can plot these readings on a graph to show how the voltage varies with the current. The current flowing through a fixed resistor is directly proportional to the voltage across is. This is shown by a straight line on a graph. The resistance in a filament bulb is not consistent such as in the fixed resistor. The resistance of the lamp increases as the temperature of its filament increases. The current flowing through a filament lamp is not directly proportional to the voltage across it. The graph in this case would look more like an S shape. The reason for the increase in resistance is because as the temperature increases, the metal ions vibrate more, therefore there will be more collisions with the flowing electrons and so more resistance.\n
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12th - Higher Ed
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Instructional Videos
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Source:
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Date
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2014
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\n\" data-title=\"Get Full Access\" data-container=\"body\" rel=\"popover\" tabindex=\"0\" aria-label=\"Play video: Resistance | GCSE Physics | Doodle Science\" href=\"/subscription/new\">\"Resistance\n\n
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