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A resistance thermometer measures temper...

A resistance thermometer measures temperature with the increase in resistance of a wire of high temperature. If the wire is platinum and has resistance of `10Omega` at `20^@C` and a resistance of `35Omega` in a hot furnace, what is the teperature of the furnace? `(alpha_("platinum") = 0.0036^@C^(-1))`

Text Solution

Verified by Experts

We assume that `alpha` is constant over the needed temperature range.
Then `DeltaR = alphaRtriangle t leades "to" (35 - 10) = 0.0036 (10)Delta`. Solving , we
get `Delta t = 25//0.036 = 694^@C. Finaly `694 +20 = 714^(@C)` (furnace temperautre.)
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CENGAGE PHYSICS-ELECTRIC CURRENT AND CIRCUIT-Exercise 5.1
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  2. It is desired to make a 20Omega coil of wire, which has a zero thermal...

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  3. A resistance thermometer measures temperature with the increase in res...

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  4. Though the drift velocity of electorn responsible for current in a con...

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  15. If a copper wire is stretched to make it 0.1% longer wha is the percen...

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  16. A copper wire having cross- sectional area of 0.5 mm^2 and a lentgth o...

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  17. A copper wire having cross- sectional area of 0.5 mm^2 and a length of...

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  18. A conductive wire has resistance of 10 ohm at 0^@C and alpha is 1/273^...

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  19. What is the drift speed of the conduction electrons in a coopper wire ...

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  20. (a) At what temperature would the resistance of a copper conductot be ...

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