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    I eliminated A but I am unable to eliminate either of the other options to arrive conclusively at the answer : C
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    I reckon it would be C .

    Units of Power is in Watts or V A since P=IV

    C mentions the Ratio of power to Current .

    I just looked at the units and concluded that V A : A would just give V ( as the Amps symbols would cancel out), which is the unit for the potiential difference across the wire.
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    We know that an expression for the power generated in the wire is P = VI. So rearranging, we get V = P/I, which means it roughly needs to have the dimensions of joules/coulomb.

    If you take the ratio of energy/current or power/charge, you don't get the same thing as before.
 
 
 
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Updated: March 31, 2011
Poll
“Yanny” or “Laurel”

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

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