lassignment/6159914 G https Electric Current The Ohm\'s Law. Resistors Problem 1
ID: 2031754 • Letter: L
Question
lassignment/6159914 G https Electric Current The Ohm's Law. Resistors Problem 17.41 5 of 26> Constants I Penodic Table Part A A platinum wire with room-temperature resistance 64.5 52 is used as a thermistor If you want to measure the temperature to within 0.5 °C in a range around room temperature, how precisely shouks the wire's resistance be measured? Express your answer to two signiticant figures and include the appropriate units. ???- 10.12. ? Submit Previous Answers equest Answe X Incorrect: Try Again; 3 attempts remaining Next Provide FeedbackExplanation / Answer
given platinum wire
with room temeprature resistance Ro = 64.5 ohm
A. we know that
R = Ro(1 + alpha*(T - 25)) ( where T is in degree celcius)
hence
dR = Ro*alpha*dT
dT = 0.5 C
hence
dR = Ro*alpha*0.5
for platinum alpha = 0.003927 per C
hence
dR = 0.12664575 ohm
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