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A wire has resistance of 3.1 ohm at 30°C and 4.5 ohm at 100°C .The temperature coefficient of resistance to the wire is ...?
R1 = 3.1 ohm at t = 300C R2 = 4.5 ohm at t = 1000C We have, R = R0 (1+αt) So, R1 = R0 (1+α * 30) R2 = R0 (1+α * 100) R1 / R2 = [(1+30α) / (1+100α)] 3.1 /4.5 = [(1+30α) / (1+100α)] Solving the above expression gives: Temp. coefficient, α = 0.0085 0C-1
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