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Flashcards in Energy Deck (25)
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1

What is energy?

Energy is the ability to do work

2

What is the source of energy on earth

The sun

3

What type of energy does the sun provide

Heat energy
Light energy

4

What is the process whereby plants make food from the sun?

Photosynthesis

5

What is a food chain

A food chain is how energy moves through all living habitats and ecosystems

The chain begins with the sun and ends with animals

6

What are the 2 groups of energy sources

Renewable and non renewable

7

What are renewable energy sources

Sources of energy that are unlimited or can be replaced

If it can be recreated in about 100 years

Examples wind, solar, water

Also called clean or green energy because it doesn't pollute

8

What are non renewable sources of energy?

Can't be replaced in a relatively short time. Most of our energy comes form fossil fuels (natural gas, crude oil)

9

Give examples of renewable energy

Wind
Wind farms ...The wind spins the turbines to create electricity

Water
Can be used to generate electricity ...this is called hydropower

Solar
Converts sunlight into electricity

10

Give examples of non renewable energy sources

Oil
Pumped out of the ground. Used in vehicles or for heating

Gas
Extracted from the ground...Used for cooking and heating or converted to electricity

Coal and uranium
Both are mined from the earth. Coal is burned to generate electricity
Uraniumis used to power nuclear generators

11

What are the 2 types of energy?

Kinetic and potential

12

What is kinetic energy?

The energy of motion...ie whenever you are moving

13

What is potential energy

Energy that is stored...example is a battery

14

What types of energy are there?

Mechanical
Electrical
Light
Thermal
Sound
Chemical

15

What is mechanical energy

Moving energy...example is a car or bike

16

Electrical energy

Caused by movement of electrons. Electric energy is in batteries and outlets in our homes. Examples would be TVs and video games

17

What is light energy

The only form of energy we can see. It is formed via chemical, radiation or mechanical means. Light energy can also be covered into other forms of energy. Examples are visible light, xrays and radio waves

18

What is thermal energy?

Energy that comes from heat...examples are cooking on a stove

19

What is sound energy

Sound energy is produced when an object is made to vibrate. Sound energy travels in all directions. Sound need to travel through a medium like air or water. Examples would be guitar etc

20

What is chemical energy

Stored energy. Once chemical energy is released from a substance that substance is transformed into an entirely different substance. Examples are batteries, coal etc

21

What is an energy transformation

The change of energy from one form to another

22

Can energy be created

No, energy can neither be created nor destroyed, but it can change from one form to another

23

Give examples of energy transformations

A toaster transforms electrical energy into thermal energy
A blender converts electrical energy into mechanical energy

24

What is input energy

An appliance needs energy to go into to it to make it work ...this is called input energy. Examples...A TV needs electrical energy as an input

25

What is output energy

The energy that an appliance creates for us to use...I.e. A toaster out put energy is thermal energy