Explanation Nichrome wire is used as a heating element in different devices like hair dryers, ovens, toasters etc. due to its high resistivity. When electric current passes through it, the high resistance of the wire starts providing heat and the process is called, Joule Heating, given by the formula P = I 2 R = V 2 R . Due to this Joule Heating, the temperature of the Nichrome filament keep on increasing just after the toaster is turned on. Now, as we know that the temperature coefficient of resistance of Nichrome is 0.00017 per °C, which is ‘positive’, therefore with the increase in the temperature of the element, the resistance of the Nichrome wire keep on increasing, which is given by the formula R t = R

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ISBN: 2818440071355

Author: GIANCOLI

Publisher: PEARSON

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Chapter 18, Problem 16Q

To determine

To explain:

The changes in the magnitude of current in a toaster having the heating element made of Nichrome wire just after it is turned on

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Chapter 18, Problem 15Q

Chapter 18, Problem 17Q

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