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## Current and Circuits Unit

PROGRESSIVE SCIENCE INITIATIVE® (PSI®)

## Resources

`Dear admin, would you please check again the answer of Homework &amp;amp;gt; MCQ &amp;amp;gt; Q6 (Graph of P vs R)? Thank you!`
`The question is asking about the resistivity of the wire (the greek letter rho). Perhaps you thought it was P for power?  As the temperature of a metal increases, its atoms vibrate more and provide more of a resistance to current flow.  So resistivity increases linearly, choice b.  Please see slides 16 and 17 of the notebook presentation for the explanation.  Thanks, John`
`The question is asking about the resistivity of the wire (the greek letter rho). Perhaps you thought it was P for power?  As the temperature of a metal increases, its atoms vibrate more and provide more of a resistance to current flow.  So resistivity increases linearly, choice b.  Please see slides 16 and 17 of the notebook presentation for the explanation.  Thanks, John`
`Dear John and Melissa, thank you for your reply.  I am sorry that I point the wrong question.  The question that I want to ask is Q18 (Graph of P vs R).  So sorry for this huge mistake.`
`The answer has no problem for Q18.  Thank you so much for your help!`
`I think we're ok with the answer. Answer (D) has a graph of P versus R.  For P = V^2/R.  Since V is constant, P is a function of 1/R. Graph (D) shows a 1/R function - large as R approaches zero, and approaching zero as R increases.  Does this help?`