1. Which of the following statements about Ohm's law is true?
(a) Ohm's law relates the current through a wire to the voltage across the wire.
(b) Ohm's law holds for all materials.
(c) Any material that obeys Ohm's law does so independently of temperature.
(d) Ohm's law is a fundamental law of physics.
(e) Ohm's law is valid for superconductors.
2. When you double the voltage across a certain material or device, you observe that the current increases by a factor of 3. What can you conclude?
(a) Ohm's law is obeyed, because the current increases when V increases.
(b) Ohm's law is not obeyed in this case.
(c) This situation has nothing to do with Ohm's law?