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Questions and Answers
Why does a longer wire have higher resistance?
What effect does a larger diameter wire have on resistance?
Which material is a better conductor of electricity based on resistivity values?
What factor affects the resistance of a wire other than its length and diameter?
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How does resistivity relate to electrical resistance in a material?
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Resistance in a wire is directly proportional to the cross-sectional area of the wire.
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Resistivity is different for each material and can vary depending on the temperature.
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A wire made of steel will have higher resistance compared to a wire made of copper, assuming all other factors are the same.
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The formula for calculating resistance in a material is Resistance = Resistivity x Length x Area.
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Electrons encounter more positive ions when navigating through a longer wire, resulting in higher resistance.
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Study Notes
- Resistance in a wire is proportional to the length of the wire, meaning a longer wire will have higher resistance because electrons need to navigate through more positive ions.
- Resistance is inversely proportional to the cross-sectional area of a wire; a wire with a larger diameter (more cross-sectional area) will have lower resistance.
- Resistivity is a measure of how much electrical resistance a material has, denoted by the symbol ρ, and it is constant for a specific material.
- The resistance of a material can be calculated using the formula: Resistance = Resistivity x Length / Area.
- Copper has a resistivity of 1.7 x 10^-8 ohm meters, while steel has a resistivity of 6.9 x 10^-7 ohm meters, making copper a much better conductor of electricity than steel.
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Description
Test your knowledge on electrical resistance and resistivity concepts in materials. Learn about the factors affecting resistance in a wire, the relationship between resistance, length, and cross-sectional area, and how resistivity is used to calculate resistance.
