A student measured the resistance of copper, wood and aluminium. Which of the three materials is the best conductor?
Question
A student measured the resistance of copper, wood and aluminium. Which of the three materials is the best conductor?
Solution
The best conductor among copper, wood, and aluminium is copper. This is because copper has the lowest resistance, which means that it allows electric current to flow through it more easily than aluminium and much more easily than wood. Here are the steps to understand this:
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Understand the concept of electrical conductivity: Electrical conductivity is a measure of how well a material accommodates the transport of an electric charge. This is directly related to the resistance of the material, which is a measure of the difficulty to pass an electric current through that material.
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Compare the resistances: In general, metals like copper and aluminium have much lower resistance than non-metals like wood, meaning they are better conductors.
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Look at the specific resistances: Among common metals used in electrical applications, copper has one of the lowest resistances (and therefore high conductivity), followed by aluminium. Wood, being a non-metal, has very high resistance and is considered an insulator rather than a conductor.
So, based on the student's measurements, copper would be the best conductor among the three.
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