   Chapter 17, Problem 42P

Chapter
Section
Textbook Problem

A certain toaster has a heating element made of Nichrome resistance wire. When the toaster is first connected to a 120.-V source of potential difference (and the wire is at a temperature of 20.0°C), the initial current is 1.80 A but the current begins to decrease as the resistive element warms up. When the toaster reaches its final operating temperature, the current has dropped to 1.53 A. (a) Find the power the toaster converts when it is at its operating temperature. (b) What is the final temperature of the heating element?

(a)

To determine
The power of toaster at its final operating temperature.

Explanation

Given Info: The toaster is connected to 120V source. The current is 1.80A when the wire is at temperature 20.0°C . Current starts decreases as nichrome resistor gets heated. At final operating temperature, current is 1.53A

Explanation:

Formula to calculate the power is,

P=IΔV

• P is the power at final operating temperature,
• I is the current at final operating temperature,
• ΔV is the potential difference across the nichrome resistor,

Substitute 1

(b)

To determine
The final temperature of heating element made up of nichrome

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