The SI unit of resistivity is
- A. ohm
- B. ohm metre
- C. ohm per metre
- D. volt per ampere
Explanation
Rearranging R equals rho L over A gives rho equal to RA over L, whose units are ohm times metre squared divided by metre, that is ohm metre. The plain ohm, equivalently the volt per ampere, is the unit of resistance itself. Resistivity is a material property, so copper has the same resistivity whether it is a thin wire or a thick bar.
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