alleryStart learning →Knock out the false circuit claims
Read exercise and reference answers
- Questions
- Question
- Three of these claims about a conductor that obeys Ohm's Law are false.
- Choices
- Item
- Resistance stays the same as voltage rises
- Correct
- Yes
- Explanation
- Current rises in step with voltage, which is what the law says
- Item
- Current stays fixed as voltage is raised
- Explanation
- These conductors give a straight line graph, never a bend
- Item
- A graph of current against voltage bends
- Explanation
- The law holds at constant temperature, warming it is not needed
- Item
- It must be warmed up before it obeys
- Question
- Three of these claims about non-ohmic conductors are false.
- Choices
- Item
- A light bulb is a common example
- Correct
- Yes
- Explanation
- Constant resistance is the mark of an ohmic conductor instead
- Item
- Their resistance never changes
- Explanation
- Nichrome wire is listed as an ohmic conductor, not a non-ohmic one
- Item
- Nichrome wire is a typical one
- 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.
_Source: Siyavula Physical Sciences Grade 11 (CC BY 4.0), Chapter 11 Electric Circuits_