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Don't know how to do electricity questions

From the physics aqa text book A AS but numbers slightly different. - page 55.
4) The resistance of a certain metal wire increased from 24.8ohms at 0C to 34.7 ohms at 100C. Assuming the resistance over this range varies linearly with temperature, calculate
(a) the resistance at 50C
(b) the temperature when the resistance is 30.0 ohms

I did part a by adding the two resistances and dividing by two but B !!!

Please help me anyone out there
Thanks so much in advance
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octionut
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Original post by HikariUchiha
From the physics aqa text book A AS but numbers slightly different. - page 55.
4) The resistance of a certain metal wire increased from 24.8ohms at 0C to 34.7 ohms at 100C. Assuming the resistance over this range varies linearly with temperature, calculate
(a) the resistance at 50C
(b) the temperature when the resistance is 30.0 ohms

I did part a by adding the two resistances and dividing by two but B !!!

Please help me anyone out there
Thanks so much in advance

Try to draw the graph of R over T then find the equation of the line in terms of T.
Original post by HikariUchiha
From the physics aqa text book A AS but numbers slightly different. - page 55.
4) The resistance of a certain metal wire increased from 24.8ohms at 0C to 34.7 ohms at 100C. Assuming the resistance over this range varies linearly with temperature, calculate
(a) the resistance at 50C
(b) the temperature when the resistance is 30.0 ohms

I did part a by adding the two resistances and dividing by two but B !!!

Please help me anyone out there
Thanks so much in advance



You asked this in the other (old) thread.
Here
http://www.thestudentroom.co.uk/showthread.php?t=2199953
Look at my answer to the question there regarding Temperature Coefficient of Resistance.
(edited 9 years ago)

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