Knock out the false circuit claims

Exercise and reference answers

Questions

1. Question

   Three of these claims about a conductor that obeys Ohm's Law are false.

   Choices

   1. Item

      Resistance stays the same as voltage rises

      Correct

      Yes

   2. Explanation

      Current rises in step with voltage, which is what the law says

      Item

      Current stays fixed as voltage is raised

   3. Explanation

      These conductors give a straight line graph, never a bend

      Item

      A graph of current against voltage bends

   4. Explanation

      The law holds at constant temperature, warming it is not needed

      Item

      It must be warmed up before it obeys

2. Question

   Three of these claims about non-ohmic conductors are false.

   Choices

   1. Item

      A light bulb is a common example

      Correct

      Yes

   2. Explanation

      Constant resistance is the mark of an ohmic conductor instead

      Item

      Their resistance never changes

   3. Explanation

      Nichrome wire is listed as an ohmic conductor, not a non-ohmic one

      Item

      Nichrome wire is a typical one

   4. Explanation

      A straight line means steady resistance, so it would be ohmic

      Item

      Their current voltage graph is straight

Instructions

Tap every claim you can prove false. The one true claim is left standing.

Explanation