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Questions and Answers
A longer wire will have lower resistance due to less positive ions it encounters.
A longer wire will have lower resistance due to less positive ions it encounters.
False (B)
A wire with a smaller diameter will have higher resistance.
A wire with a smaller diameter will have higher resistance.
True (A)
Resistivity is different for each material.
Resistivity is different for each material.
False (B)
The formula to calculate resistance is: Resistance = Resistivity x Area / Length.
The formula to calculate resistance is: Resistance = Resistivity x Area / Length.
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Copper is a better conductor of electricity than steel because it has higher resistivity.
Copper is a better conductor of electricity than steel because it has higher resistivity.
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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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