Which of the following statements is true about ohmic conductors? (i) The graph of current versus vo

Question

Which of the following statements is true about ohmic conductors?
(i) The graph of current versus voltage for an ohmic conductor is a straight line
(ii) The resistance can change depending on the direction of the current flow
(iii) The current through an ohmic conductor is directly proportional to the voltage across the conductor
(iv) The resistance of an ohmic conductor is constant

Answer 1

Which of the following statements is true about ohmic conductors?
(i) The graph of current versus voltage for an ohmic conductor is a straight line
(ii) The resistance can change depending on the direction of the current flow
(iii) The current through an ohmic conductor is directly proportional to the voltage across the conductor
(iv) The resistance of an ohmic conductor is constant

(i), (ii) and (iv) only
(i), (iii) and (iv) only ✓
(i) and (ii) only
(ii) and (iii) only

Explanation

An ohmic conductor obeys Ohm’s law. Its current-voltage graph is a straight line through the origin, and current is directly proportional to voltage. Its resistance stays constant.

Statement (ii) is false, because the resistance does not change with current direction. So (i), (iii) and (iv) only are true.

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