Electrical inverse relationship

Electrical inverse relationship

Secondary 2
6 marks
TGM Original Questions

For a variable resistor connected across a constant voltage, resistance \(R\) ohms is inversely proportional to current \(I\) amperes. Its resistance is \(0.5\,\Omega\) at \(12\) A.

  1. Form an equation connecting \(R,I\).[2]
  2. Find \(R\) at \(4\) A.[2]
  3. Find \(I\) when \(R=3\,\Omega\).[2]

Solution:

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Answer:(i) \(R=\dfrac6I\) (ii) \(1.5\,\Omega\) (iii) \(2\) A.

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