A platinum-resistance thermometer has a resistance of 5Ω at 0°C and 9Ω at l00°C. Assuming that resistance changes uniformly with temperature, calculate the resistance of the thermometer when the temperature is 45°C.
13.9 Ω
8.9 Ω
6.8 Ω
3.2 Ω
1.8 Ω
Explanation
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Discussions (16)
Smiles. Myschool is spanking correct and C is the correct answer
The question is from resistance thermometer and to get the temperature of a body using the thermometer,the below formula will be applied
t=R-Ro/R100-Ro*100
here we are asked to look for R
Making R the subject of the formula we have
R=t(R100-Ro)/100+Ro
R=45(9-5)/100+5
R=45(4)/100+5
R=180/100+5
R=1.8+5
R=6.8ohms
Therefore option C is conclusively correct!
the question is correct but the options are wrong. how sure are we that the computer does not mark us wroung when we are wright and dat the examiners did not set a wrong question? we can only pray that God helps us in this exams.
that ans is wrong the ans is 36.5 ohms p/s my sch give an explanation because i repeated several time and got the same ans i am confused
