U5_HEAT AND LIGHT_gamificada

HEAT AND LIGHT

Hi guys! Now that you are experts on energy sources, let's travel to a new destination to learn a lot about these two types of energy especifically.

Table of contents

0. Guess the destination

1. Thermal energy

2. Thermal energy effects

3. Light energy and its uses

5. Light > Heat transfer

4. Laws of light

6 Get to know T. A. Edison

Guess the destination...

FOLLOW THE CLUES PROFESSOR LAVROF HAS PROVIDED AND FIND OUT ABOUT THE NEW place WE WILL VISIT THIS TIME...

Camon guys! You can do it!

Guess which state...

• ... is near "The Big Apple."
• ... was first inhabited by the Lenape tribe.
• ... is known as "The Garden State."
• ... is where you can visit the theme park "Storybook Land."
• ... is where the lightbulb was invented in 1880.

Yes! Yes! Yes! You did it again!!

Well done guys!!! You guessed the place where I'm doing my new research on light. Welcome to New Jersey!

In New Jersey we will visit the Thomas Edison Center at Menlo Park to know about the father of the lightbulb, among other many inventions.

click here to visit the menlo park museum

But first, we will learn about another type of energy different from light... Let's study HEAT... that is...

1. THERMAL ENERGY

Thermal energy always travels from a hotter object to a colder one. But how??CONDUCTION: solid objects transfer thermal energy by contact. This process is called "conduction." When two objects are in contact, the molecules in the hotter object are moving faster and release energy that is trasnferred to the colder object. Then the molecules in the colder object receive the energy released and start moving faster too. As the result, the second object gets hotter and the first one will cool down with time.

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Let's learn more about how thermal energy is "conducted:"

Watch the video to know about conductors and insulators.

CONVECTION: in gases and liquids, thermal energy travels by a process called "convection." When some molecules of the liquid or gas receive thermal energy they start moving faster and rise up, while the colder molecules will move down. As a result, a circular movement takes place that will end up heating the whole gas or liquid. In the image the liquid inside the pot is getting the energy released by the pot through this process. It is signaled by the black circular arrows. RADIATION: thermal energy can be also transferred through space by electromagnetic waves. This is process is called "radiation." In the image part of the thermal energy generated by the cooker escapes into the space through these electromagnetic waves. The thermal energy generated by the Sun also travels this way.

1. THERMAL ENERGY II

2. THERMAL ENERGY EFFECTS

Thermal energy causes changes in the state of some materials through different processes:

CHEMICAL CHANGES

EVAPORATION

MELTING

EXPANSION

Info

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Info

3. LIGHT ENERGY & ITS USES

Light is the energy we can see with our eyes. It is made up of microscopic particles called photons, which travel in straight lines.

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Let's recap with this video...

4. BASIC LAWS OF LIGHT

Refraction:When light passes through some transparent substances, like water, it changes direction slightly. This process is called refraction. As a result, when we look at an object submerged in water, it appears to be bent, because water is refracting the light.

Reflection:We know that light travels in straight lines. However, some surfaces, like mirrors, cause light to bounce off and change direction. This process is called reflection. As a result, we see the object reflected in the mirror.

+ info

5. HOW IS LIGHT TRANSFORMED INTO HEAT?

Light energy

Thermal energy

This absorbed energy makes the molecules of the object vibrate faster. Thus, if we touch the object, we feel this vibration as heat or thermal energy.

When light energy hits an object, some of the energy is absorbed by the object.

If we open a window, the thermal energy or heat escapes from the car, and the temperature inside begins to go down.

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THANK YOU FOR YOUR ATTENTION UP TO HERE!

¡Eureka!

But don't forget that smart guy called Thomas A. Edison... Do you remember him? Not only did he invent the lightbulb, but he also created many more inventions... Let's learn a little more about him... You might need to do some reasearch about some of his creations in a near future...