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प्रश्न
Bring out clearly two differences between electric resistance and electric specific resistance.
फरक स्पष्ट करा
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उत्तर
| Basis of Difference | Electric resistance | Electric specific resistance |
|---|---|---|
| 1. Meaning | Electric resistance is the opposition offered by a conductor to the passage of drifting electrons through it. | Electric specific resistance is the resistance offered by a conductor of unit length and unit area of cross-section. |
| 2. Dependence | Electric resistance depends on the material, length, area of cross-section and temperature of the conductor. | Electric specific resistance depends only on the material and temperature of the conductor. |
| 3. Formula | Electric resistance is given by $$R = \rho \frac{l}{A}$$. | Electric specific resistance is given by $$\rho = \frac{RA}{l}$$. |
| 4. SI unit | The SI unit of electric resistance is the ohm ($$\Omega$$). | The SI unit of electric specific resistance is ohm-meter ($$\Omega \text{ m}$$). |
| 5. Effect of size | Electric resistance changes with the length and area of the cross-section of the conductor. | Electric specific resistance does not change with the shape or size of the conductor. |
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