WAEC Physics 2020 Objective — Question 23
Question 23 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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Which of the current-voltage characteristics shown below is that exhibited by an ohmic conductor?
- A. Graph A
- B. Graph BCorrect
- C. Graph C
- D. Graph D
Explanation
A device is ohmic if it obeys Ohm's law, i.e. V is proportional to I with a constant slope (a straight line through the origin), as shown by the graph labelled B for an ohmic conductor. A non-ohmic conductor does not obey Ohm's law; its resistance changes based on the current moving through it.
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