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home / study / questions and answers / science / advanced physics / while taking photographs in death valley on a day ... Question While taking photographs in Death Valley on a day when the temperature is 52.0°C, Bill Hiker finds that a certain voltage applied to a tungsten wire produces a current of 1.000 A. Bill then travels to Antarctica and applies the same voltage to the same wire. What current does he register there if the temperature is 88.0°C? Assume no change occurs in the wire's shape and size.

Explanation / Answer

resistance changes with the temperature and decreases with the decrease in temperature

R = Ro ( 1 - T)

is temperature coefficent in /ºC
for Tungston is 0.0045 /ºC

let volatge as 1 ohm and resistance as 1 ohm

R = 1 (1 - 0.0045(52-(-88))

R = 0.37 ohm

current when 1 volt is applied I = V/R = 1 / 0.37 = 2.64 A

cuurent registered at -88 °C = 2.64 A

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