Identify the best definition of electrical resistance.
A
It is a measure of how much an object impedes an electric current
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B
It is caused by free electrons in the material
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C
It is a measure of a material's resistivity
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D
It is another name for resistivity
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E
It increases with increasing current
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Solution
The correct option is A It is a measure of how much an object impedes an electric current
Electric resistance is defined as the difficulty offered by a material to pass an electric current through that material i.e measure of how much a material impedes an electric current.
It is measured in ohms (Ω).
Resistance R=VI⟹R∝1I (V =constant)
Thus resistance decreases with increase in current.