Question
Download Solution PDFThe ratio of potential difference across the terminals of a conductor to the current flowing through it is the:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Ohm’s law: At constant temperature, the potential difference across a current-carrying wire is directly proportional to the current flowing through it.
i.e. V = IR
Where V = potential difference, R = resistance and I = current.
EXPLANATION:
- According to ohm's law, V = IR
The above equation can be written for resistance as
\(\Rightarrow R = \frac{V}{I}\)
- Therefore the resistance is defined as the ratio of potential difference across the terminals of a conductor to the current flowing through it. Therefore option 1 is correct.
- The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. Therefore option 2 is incorrect.
- Conductivity is the measure of the ease at which an electric charge or heat can pass through a material. Therefore option 3 is incorrect.
- The reciprocal of electrical resistance is called conductance. Therefore option 4 is incorrect.
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