Solar panels were invented by a French physicist who saw a voltage develop when sunlight hit an electrode. They work by using solar energy to generate electricity without air pollution, unlike burning coal. LED lights are used for flashlights, signs, and more and help save energy by using the same lower energy while brightening rooms more than traditional flashlights. Hybrid cars were created to address global warming and improve fuel efficiency. They help the environment by using less fuel and some electric energy, causing less air pollution than gasoline-only cars.

1. PBL #3
Solar Panels
LED lights
Hybrid Cars

2. Solar panels
• How was it invented?
A French physicist invented it as he was
experimenting, he saw a voltage develop
when sunlight fell on the electrode
• How does it work?
Uses solar energy to generate electricity

3. Solar Panels
• How does it help the environment?
Rather than causing air pollution by burning
coal, it uses renewable energy

4. LED lights
• How is it used?
Used for flashlights, signs, Christmas lights,
lamps
• How does it help save energy?
it uses the same lower energy while
brightening up the room

5. Compare & contrast flashlight to LED
light:
What is the same?
What is different?

6. Hybrid Cars
• How it is used?
People use it to save money and to save the
environment

7. How it was invented?
It was created as a response to global warming
and to improve fuel efficiency
How it helps the air around us?
It uses less fuel and some electric energy to
cause less air pollution