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# How does temperature affect the resistance of a wire?

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The resistance of a typical conducting wire is low when temperature is low and high when temperature is high. The increase in resistance alongside temperature is due to an increase in energy of the wire atoms, which cause them to vibrate more and impede the path of the electrons flowing through.

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A good example of resistance changing with respect to temperature is a standard light bulb. At first, while it is completely cool, very little light is produced. As the filament heats up, the resistance increases, which in turn produces more heat and more light. If temperatures are low enough, certain materials can approach zero resistance, called superconductors.

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## Related Questions

• A:

To test a capacitor with a multimeter, discharge the capacitor, set the multimeter to test for resistance then interpret the reading. There are other testing methods other than resistance that can be used. Since capacitors store voltage, the multimeter is also capable of reading volts, so if the multimeter being used has a capacitance meter, the actual capacitance value is given.

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• A:

Electrical currents always follow the path of least resistance. They require three conditions in order to flow: a difference in voltage between two points, a conductive path and a closed circuit. When these conditions are met, current flows from the higher voltage point to the lower point.

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• A:

Neither a voltmeter nor an ammeter measures resistance directly; a voltmeter measures voltage and an ammeter measures amperage or current. However, using Ohm's law, resistance can be calculated from known quantities of voltage and current.