1. Lesson 2
How is light produced?

2. What light is VS. What light isn’t
Light is bright rays.
Light isn’t dark.
Light is a type of matter, something like plasma.
Light isn’t solid.
Light is streams of invisible, tiny particles, like radiation.
Light isn’t made up of matter because we can’t feel it.
Light is a beam of energy.

3. Luminous means these objects can produce or give out their own light
Sources of Light
LUMINOUS
REFLECTED
Lightbulb
Mirrors
Fire
Road signs
Lightning
Movie screen
Glow sticks
Moon
Luminous means these objects can produce or give out their own light

4. Energy Energy is the capacity to do work
Work is done when a force moves an object
Light is a form of energy – electromagnetic energy
The Law of Conservation of Energy – energy cannot be created or destroyed, it can only change from one form to another

5. Forms of Energy Electromagnetic (Light) Electrical Thermal (heat)
Mechanical
Nuclear
Chemical energy
Gravitational energy

6. Potential Energy Potential = Stored energy
Gravitational energy – energy an object has because of its position; anything “up high”
Chemical energy – energy stored in a substance
Fuel
Batteries
Food
Nuclear energy – energy stored in the nucleus of an atom
Sun

7. Kinetic Energy Kinetic energy = energy in motion
Mechanical (motion) energy – movement of objects of substances from one place to another
Electrical energy – electricity moving through an object
Electromagnetic – energy that travels in waves
Light
Thermal (heat) energy – vibration of atoms to make heat
Friction

9. Energy Transformations
Example 1: Toaster plugged into an outlet
Electrical  Thermal
Example 2: Plugging a fan into an outlet
_______________  _________________ and _______________
Example 3: Wind turbine to light

10. Now that we’ve practiced…
What energy transformations took place in the flashlight and the candle?
Flashlight:
Candle: