Thermal energy is also referred to as heat energy. Thermal energy moves from warmer objects to cooler objects. If you put an ice cube in warm tea, heat moves from the tea to the ice cube. The ice cube does not send coldness to the tea.
Thermal energy moves during conduction, convection, and radiation. Conduction of heat occurs between two solids that are touching each other. Convection of heat occurs in liquids and gases when heat rises upwards and cool liquids or gases sink. Eventually, the temperature evens out. Radiation of heat is given off as waves in air or empty space.
Thermal energy sources like stoves, the Sun, and fire are used to keep warm and cook.
Mechanical Energy
Any moving object has mechanical energy. In a hydroelectric dam, mechanical energy from moving water is converted (changed) into electrical energy.
There are two types of mechanical energy: potential energy and kinetic energy. Water has potential energy when it is still behind the dam. When the water is released and moves, it has kinetic energy.
Mechanical energy is used when throwing a ball, pedaling a bicycle, and using a hammer.
Sound Energy
Sound is caused by vibrations. When someone hits a drum, the energy the vibrations produce moves through the air in waves to your eardrums. As the air particles move, they bump into each other. They can be clumped together or spaced far apart. When the waves
reach your ears, you hear the sound.
Sound must move through matter. The closer particles in a substance are, the faster sound moves. So, sound moves more quickly through solids than liquids or gases.
Sound energy is used for communication, music, and alerts.
Electrical Energy
Tiny charged particles called electrons are always moving. This is electricity.
Electrical energy travels through a conductor, a material that allows electricity to flow through. Most metals are good conductors of electricity. For example, copper is used in many wires for our household appliances.
Because electrical energy can be changed into heat, sound, light, and mechanical energy, we use it to power devices in our homes like toasters, fans, and televisions.
Light Energy
Light energy travels in waves and can move through matter and empty space. When light
strikes an object and goes straight through, light is transmitted. When light is taken
in by an object, light is absorbed.
We primarily use light to help us see. Light energy has a special use. It can be used by a solar panel to produce electricity.
The solar panel converts light from the Sun into electricity we can use!
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Question 7 | 00:32
Question 8 | 01:14
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Question 11 | 03:00
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Question 7
00:32
Question 8
01:14
Question 9
01:19
Question 10
01:46
Question 11
03:00
Question 12
03:18
Question 13
03:45
Question 14
14.
Place the switched or lights in the correct positions to build a circuit diagram with a battery, 2 lit bulbs, 1 unlit bulb, 1 closed switch, and 1 open switch.
Other Answer Choices:
Question 15
15.
Match each object with the energy transfer that takes place.
Mechanical → Electrical
Electrical → Thermal
Electrical → Sound & Light
Light → Electrical
Question 16
16.
Match the form of energy used to produce electrical energy.
Light
Mechanical
Question 17
17.
Place the images in the correct label based on how each form of energy is USED. There will be 2 cards in each label.
Mechanical
Electrical
Light
Thermal
Sound
Observe the image. Then identify an example of each energy form.
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Question 18
18.
How is electrical energy being used?
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Question 19
19.
How is thermal energy being used?
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Closely read the table.
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Question 23
23.
What are the 3 ways that heat can move?
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Question 24
24.
Heat moving from the Sun through empty space to warm Earth’s surface is an example of what process?
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Question 1
1.
What are two uses of thermal energy?
1) _______
2) _______
Question 2
2.
What are two uses of mechanical energy?
1) _______
2) _______
Question 3
3.
What are two uses of sound energy?
1) _______
2) _______
Question 4
4.
What types of energy can electrical energy be used to produce?
Question 5
5.
What type of energy is used by a solar panel to produce electricity?
Question 6
6.
What structure is used to convert mechanical energy from moving water into electrical energy to power our homes?
Question 20
20.
How is mechanical energy being used?
Question 21
21.
How is light energy being used?
Question 22
22.
While you can’t hear the image, what is one type of sound do you imagine is used in a busy kitchen?
Question 25
25.
Heat spreading from one solid object to another solid object directly touching it is an example of what process?
