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When a 12 \(V\) battery is connected across an unknown resistor, there is a current of 2.5 \(mA\) in the circuit. Find the value of the resistance of the resistor.
 
[Note: Enter the final answer up to one decimal place.]
 
In terms of ampere, the value of current is .
 
From the Ohm's law, i=i×i, the formula of resistance is found as
 
i=ii
 
On substituting the given values, we get the resistance as  \(\Omega\). The value can also be written as  \(k\Omega\).