What is the fractional change in the resistance of an iron filament when its temperature changes from 25.0°C to 50.0°C?

A copper wire has a resistance of 0.475 at 20.0°C, and an iron wire has a resistance of 0.495 at the same temperature. At what temperature (in °C) are their resistances equal? Enter a number. °℃

Question 3: A platinum resistance thermometer is a device that allows us to determine the temperature by measuring the resistance of a piece of pure platinum wire. In the interval between the freezing point of water and 700.0°C, the relationship between the resistance and the Celsius temperature Tc is accurately captured by the formula R = Ro (1 + A Tc + B (Tc)²) where A and B are constants determined by measurements at the ice point of water, the steam point of water, and the melting point of zinc (419.514°C). (a) If R equals 10.000 ohms at the freezing point of water, 13.946 ohms at the boiling point of water, and 24.174 ohms at the melting point of zinc, find RO, A, and B (b) If the resistance is measured to be 17.7 ohms, what is the temperature? (c) Plot R versus Tc in the range from 0°C to 700.0°C. Math tip: When we have several equations for several unknown variables, we can use the first equation to solve for one of the variables in terms of the others and then replace that…

A length of aluminum wire has a resistance of 28.0 Ω at 32.0°C. When the wire is warmed in an oven and reaches thermal equilibrium, the resistance of the wire increases to 43.1 Ω. (a) Neglecting thermal expansion, find the temperature of the oven. °C(b) Qualitatively, how would thermal expansion be expected to affect the answer?

A thermistor is a device whose resistance varies with temperature. At 20∘C∘C a thermistor's resistance is 10.0 kΩkΩ. When connected to a 1.2 VV battery, the current through the thermistor increases by 80 μAμA as the temperature increases to 30∘C. What is the thermistor's resistance at this higher temperature?