A toaster using a Nichrome TM heating element operates on 120 V. When it is switched on at 20°C. the heating element carries an initial current of 1.35 A. A few seconds later the current reaches the steady value of 1.23 A. (a) What is the final temperature of the element? The average value of the temperature coefficient of resistivity for Nichrome TM over the temperature range from 20°C to the final temperature of the element is 4.5 × 10 −4 (C°) −1 . (b) What is the power dissipated in the heating element (i) initially; (ii) when the current reaches a steady value?
A toaster using a Nichrome TM heating element operates on 120 V. When it is switched on at 20°C. the heating element carries an initial current of 1.35 A. A few seconds later the current reaches the steady value of 1.23 A. (a) What is the final temperature of the element? The average value of the temperature coefficient of resistivity for Nichrome TM over the temperature range from 20°C to the final temperature of the element is 4.5 × 10 −4 (C°) −1 . (b) What is the power dissipated in the heating element (i) initially; (ii) when the current reaches a steady value?
A toaster using a NichromeTM heating element operates on 120 V. When it is switched on at 20°C. the heating element carries an initial current of 1.35 A. A few seconds later the current reaches the steady value of 1.23 A. (a) What is the final temperature of the element? The average value of the temperature coefficient of resistivity for NichromeTM over the temperature range from 20°C to the final temperature of the element is 4.5 × 10−4 (C°)−1. (b) What is the power dissipated in the heating element (i) initially; (ii) when the current reaches a steady value?
The copper windings of a motor have a resistance of 46 Ω at 20oC when the motor is idle. After the motor has run for several hours, the resistance rises to 59 Ω. What is the temperature in Celsius of the windings now? Ignore changes in the dimensions of the windings. The temperature coefficient of resistivity for copper is 4.3 × 10-3 K-1.
A toaster has a Nichrome (a-4.5x10 °c) heating element that has a resistance of Ro= 80 n at a temperature T-20 °C. When the toaster is turned on, the resistance of the element
rises to 89.1 2 and its temperature is increased. Find the final temperature (in °C) of the heating element.
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 54.0°C and notes that it produces
a current of 1.40 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 × 10−³ (°C)−¹. (Assume that the reference temperature is 20°C.)
A
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How To Solve Any Resistors In Series and Parallel Combination Circuit Problems in Physics; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=eFlJy0cPbsY;License: Standard YouTube License, CC-BY