WAEC - Physics (2003 - No. 10)
A platinum resistance thermometer has a resistance 4\(\Omega\) at 0oC and 10\(\Omega\) at 100oC. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45oC.
14.0\(\Omega\)
6.7\(\Omega\)
3.2\(\Omega\)
2.7\(\Omega\)
Explanation
\(\frac{R - 4}{10 - 4} = \frac{45 - 0}{100 - 0}\)
R = \(\frac{670}{100} = 6.7\Omega\)
R = \(\frac{670}{100} = 6.7\Omega\)