How do refrigerators work

How do refrigerators work

Have you ever wondered how a refrigerator works. well there is some components we need to understand first.

Learning Objective

• Define a thermostat 

• Describe a bimetallic coil. 

Multiple Choice

Have you see this before in your homes ? what does it do ?

• Controls and regulates the temperature in your home

• Used to make music

• Used for cooking

• Used to play Call of duty

Thermostat

A device responsible for regulating the temperature of a system.

Most thermostats contain a bimetallic coil that is responsible for turning the air conditioner off and on

Multiple Choice

What is the name of this ?

• Thermostat

• Power control

• Thermometer

• Iron

Multiple Choice

What is the function of a Thermostat

• Regulates temperature in a room or a system

• Put the room lights off and on

• used to watch TV

• Used to start a car

Thermostat

Now lets break the thermostat and see what we find inside

What do we have here ?

Number 2 is very important to us, this is called a bimetallic coil or bimetallic spring

Bimetallic coil or spring

bimetallic coil that is responsible for turning the air conditioner off and on

Other examples of bimetallic coils and springs

Watch the video shown by your teacher on how this bimetallic coil works

What happen during this experiment ?

Multiple Select

what happen during this experiment ?

• Thermal expansion-when the ball is hot it gets bigger and does not fit through the ring

• Thermal contraction-when is cold it gets small and goes through the ring

• nothing happens

• option A and B

Let us end this lesson by answering a short quiz

Good luck

Multiple Choice

A thermostat is a device that ____________

• Automatically regulates temperature

• Measures thermal energy

• reads temperature

Multiple Choice

The thermostat below detects an increase in room temperature as

• an increase in thermal energy causes a bimetallic coil to curl

• an increase in thermal energy causes a bimetallic coil to uncurl

• a switch causes a bimetallic coil to curl

• a switch causes a bimetallic coil to uncurl

Multiple Select

Analyse the following picture and choose the correct answer or answers

• when it is hot the coil expands and gets bigger

• when it is cold the coil contracts and becomes smaller

• the coils are independant to contraction and expansion

• this is a bimetallic coil found in thermostats