# You and your roommates are studying hard for your physics exam. You study late into the night and then fall into your bed for some sleep. You all wake early before the exam and scramble groggily around making breakfast. You can’t agree on what to have, so one of you cooks waffles on a 990-watt waffle iron while another toasts bread in a 900-watt toaster. You want to make coffee with a 650-watt coffeemaker, and you plug it into the same power strip into which the waffle iron and toaster are plugged. Will the 20-A circuit breaker remain operational?

### Physics for Scientists and Enginee...

10th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781337553278

### Physics for Scientists and Enginee...

10th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781337553278

#### Solutions

Chapter
Section
Chapter 27, Problem 29P
Textbook Problem
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## You and your roommates are studying hard for your physics exam. You study late into the night and then fall into your bed for some sleep. You all wake early before the exam and scramble groggily around making breakfast. You can’t agree on what to have, so one of you cooks waffles on a 990-watt waffle iron while another toasts bread in a 900-watt toaster. You want to make coffee with a 650-watt coffeemaker, and you plug it into the same power strip into which the waffle iron and toaster are plugged. Will the 20-A circuit breaker remain operational?

Expert Solution
To determine

The reason that 20A circuit breaker will remains operational or not.

### Explanation of Solution

Given Information: The power across the waffle iron is 990W , power across the toaster is 900W , power across the coffee maker is 650W .

Let the kitchen wall outlets are all part of the same 110V circuit which has a 20A circuit beaker to protect the wire carrying the largest current from getting too hot.

V=110V

Here,

V is the voltage source across the kitch wall outlets.

Formula to calculate the total power across the circuit is,

Ptotal=Pwaffleiron+Ptoaster+Pcoffeemaker (1)

Here,

Ptotal is the total power across the circuit.

Pwaffleiron is the power across the waffle iron.

Ptoaster is the power across the toaster.

Pcoffeemaker is the power across the coffee maker.

Substitute 990W for Pwaffleiron , 900W for Ptoaster , 650W for Pcoffeemaker in equation (1) to find

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