A certain light bulb has a tungsten filament with a resistance of 13.0 Ω when cold ( 20.0°C ) and 180 Ω when hot.  Find the temperature of the filament when it is hot.  The resistivity of tungsten is 5.6*10-8 Ω·m , and the temperature coefficient of resistivity is 4.5*10-3 (°C)-1 .

A copper wire has a resistance of 0.375 2 at 20.0\deg C, and an iron wire has a resistance of 0.400 at the same temperature. At what temperature (in \deg C) are their resistances equal?

The resistance of a coil of copper wire is 4 Ω at 5 °C . What is the resistance at 55 °C .The coefficient of resistivity for copper is 4.3 × 10−3°C−.

A platinum resistance thermometer has a resistance R0 = 50 Ω at atemperature To of 20 °C. The temperature coefficient of resistance for theconductor for Pt (α) is 3.92 x 10-3 (°C)-1. The thermometer is immersed in avessel containing molten tin, at which point the resistance increases to 92.8Ω. What is temperature of the liquid tin?

What length of gold wire, of radius 0.27 mm, is needed to make a 15.5 Ω resistor, if the resistivity of gold is 2.44×10-8 Ω·m? The length, L =

A common flashlight bulb is rated at 0.34 A and 2.3 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 1.0 2, what is the temperature of the filament when the bulb is on? The temperature coefficient of resistivity is 3.7 x 10-3 K-1 for the filament material.

A silver wire has a resistance of 2.00 Ω at 34.0°C. Determine its resistance (in Ω) at 434°C. The temperature coefficient of resistivity for silver wire is 3.80 ✕ 10−3 (°C)−1. (Assume that the temperature coefficient of resistivity was measured using the reference temperature 20°C.)

An engineering intern is studying the effect of temperature on the resistance of a current carrying wire. She applies a voltage to a aluminum wire at a temperature of 53.0°C and notes that it produces a current of 1.10 A. If she then applies the same voltage to the same wire at -88.0°C, what current should she expect (in A)? The temperature coefficient of resistivity for aluminum is 3.90 x 10-³ (°C)-¹. (Assume that the reference temperature is 20°C.) A