At room temperature (27.0 °C) the resistance of a heating element is 100 Q. What is the temperature of the element if the resistance is found to be 117 N, given that the temperature coefficient of the material of the resistor is 1.70 × 10-4 °c-1.
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- A material of resistivity p is formed into a solid, truncated cone of height h and radii r₁ and r2 at either end. Calculate the resistance of the cone between the two flat end faces.In a 100-m-long conductor of cylindrical cross-section (radius ro = 5 mm), the axial current density is J = î2 A/m². The conductivity is o= 5.8-107 S/m. Find a) the current flowing through the conductor, b) the voltage across the entire length of the conductor, c) the overall resistance of the conductor.A tungsten wire in a vacuum has length 26.0 cm and radius 6.00 mm. A potential difference is applied across it. (a) What is the resistance of the wire at 293 K? Ω (b) Suppose the wire reaches an equilibrium temperature such that it emits 70.0 W in the form of radiation. Neglecting absorption of any radiation from its environment, what is the temperature of the wire? (Note: e = 0.320 for tungsten.) K (c) What is the resistance of the wire at the temperature found in part (b)? Assume the temperature changes linearly over this temperature range. Ω. (d) What voltage drop is required across the wire? (e) Why are tungsten lightbulbs energetically inefficient as light sources?
- Resistance, R, is defined using R = V/I where V is the potential across a resistor, and I is thecurrent. R is measured in ohms (Ω), where 1 Ω = 1 V/A. The constant you determined in eachequation should be similar to the resistance of each resistor. However, resistors aremanufactured such that their actual value is within a tolerance. For many common resistors, thetolerance is 5% or 10%. Calculate the range of possible values for each resistor. Does the constant in each equation fit within the appropriate range of values for each resistor? Do the resistors follow Ohm’s law? Base your answer on your experimental data. Slope (V/A) Y-intercept (V) Resistor 10 Ω 9.896V/A 0.0005526V Resistor 51 Ω 50.91V/A 0.01030V Light bulb (first 3 pts) 5.386V/A n/a Light bulb (last 10 pts) 43.26V/A n/aSuppose at 70°C the resistance of a platinum resistance thermometer is 170 Ω. When placed in aparticular solution, the resistance is 7+100 Ω. What is the temperature of this solution?Temperature Coefficient of resistivity for platinum is 3.93 x 10-3 1/ 0 C.When initially at 20°C, the power being supplied to a 691 Ohm resistor in a circuit is 8.29 W. Over time, the temperature of the resistor increase to 168°C. If the temperature coefficient of resistivity of the material composing the resistor is 5.75 x 10-3 °C-1, what power is supplied to the resistor at its operating temperature?