Question 1000199
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The current I in an electrical conductor varies inversely as the resistance R of the conductor. The current is 1/5 ampere when the resistance is 21875 ohms.  What is the current when the resistance is 42875 ohms?
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The condition states that  I = {{{U/R}}},  where  U = const.  (By the way,  physically   U is electric potential difference across the resistance). 


In other words,  the product  I*R  is the constant value  U.


Therefore,  you have an equation


{{{1/5}}}.{{{21875}}} = {{{x}}}*{{{42875}}}.


where  x  is the unknown current.  Hence,


x = {{{(1/5)*(21875/42875)}}} ampere.