1. Energy Sources

2. RENEWABLE RESOURCES
natural resources that can be replenished in a short period of time.
● Solar
● Wind
● Water

3. What are renewable resources?
Renewable resource: a resource that can be replaced within a reasonable amount of time.
for example: solar energy (sun), hydroelectric energy (water), and wind energy.
Not all energy resources need to be burned in order to release energy.
This slide includes a BrainPop video clip on natural resources.

4. Why is energy from the sun renewable?
SOLAR Energy:
Energy from the sun.
Why is energy from the sun renewable?

5. Is Solar Power Renewable?
Solar power is renewable.
The Sun will keep on shining anyway, so it makes sense to use it.

6. Solar Power Solar Cells:
convert light from the sun directly into electricity.
Example: highway signs.

7. Disadvantages to Solar Power
Doesn't work at night.
Very expensive to build solar power stations.
Solar cells cost a great deal.
Can be unreliable unless you're in a very sunny climate.

8. 2) Hydroelectric Energy from the flow of water.
Hydro-electric power is renewable.
Because water is constantly recycled and isn’t used up as fossil fuels.

9. Hydroelectricity A dam is built to trap water.
Water is allowed to flow through tunnels in the dam, to turn turbines and thus drive generators.
Generators will produce “Electricity” .

10. Why is energy from the wind renewable?

11. Advantages to Wind power
Wind is free.
Produces no waste or pollution.
A good method of supplying energy to remote areas.
Moving air can power windmill turbines that produce electricity.( like falling water.)

12. Is Wind Power Renewable?
Wind power is renewable.
Winds will keep on blowing, it makes sense to use them.

13. Why we still need non-renewable resources??
Since we don’t have yet the technology to get enough energy from renewable resources at a reasonable cost.
However, Scientists are working to find lower-cost ways to using renewable resources in the future.
Example: researches done on hybrid car.

14. Hybrid car

15. Hybrid car
Runs on electricity at slow speeds & on gasoline at high speeds.
Gasoline engine:
Make the car run at high speed & also runs a generator which produces electricity.
Generator:
Produces electricity which is stored in the batteries or used by the electric motor.
Electric motor:
Use electricity from the batteries or from the generator to make the car run at slow speed.

16. Hybrid car
Runs on electricity at slow speeds & on gasoline at high speeds.
Gas tank:
Holds the fuel for the gasoline engine.
Batteries:
Store chemical energy, which is changed to electrical energy.
When it travels the same distance
as a regular car, it burns less fossil
Fuels.( Conserving energy & reducing pollution).

17. Conservation & the Environment
An advantage of conserving energy resources is that it reduces harm to the environment.
Burning of coal, oil and natural gas to release energy stored in them also produces pollution.
Pollution:
Is anything that dirties or harms the environment.

18. Disadvantages of Using Fossil Fuels
Basically, the main drawback of fossil fuels is pollution.
Burning any fossil fuel produces gases, which are released into the atmosphere causing pollution. (Some of the gases are even poisonous) .
Burning coal produces gases that combine with water in the air to form acid rain, which harm animals and plants..

19. How can you help the Environment?
( Conserving energy ) .
In our everyday lives, we can also work to conserve energy.
Insulating, turning off lights and only using appliances like dishwashers when they are full are just some of the ways
people can limit energy use in their homes.( don’t run appliances at peak period, close shades & blinds on hot days).
Also, bicycling, and taking public transportation are effective energy-saving ideas.