1. Light

2. Electromagnetic Spectrum
Light is an electromagnetic energy.
Travels in the form of an electromagnetic wave.
Chapter 19 Sections: 1, 5, 6, 8, 9, 10
Chapter 20 Sections: 2, 4, 5, 6, 7, 8, 9

3. Electromagnetic Spectrum
Chapter 19 Sections: 1, 5, 6, 8, 9, 10
Chapter 20 Sections: 2, 4, 5, 6, 7, 8, 9

4. Photosynthesis
Plants use light energy to make food for itself in a process called photosynthesis.
6CO2
6H2O
6CO2
6H2O
C6H12O6 +
Chapter 19 Sections: 1, 5, 6, 8, 9, 10
Chapter 20 Sections: 2, 4, 5, 6, 7, 8, 9
6O2

5. How Do Lenses Refract Light?
Lens is a transparent material that refracts light.
Virtual Image
focus
Chapter 19 Sections: 1, 5, 6, 8, 9, 10
Chapter 20 Sections: 2, 4, 5, 6, 7, 8, 9
focus
Real Image
Object
Object

6. How Do Mirrors Reflect Light?
When light strikes a smooth surface the light is reflected. This type of reflection is called a regular reflection.
If light strikes a rough surface it will be reflected at many different angles forming a diffuse reflection.
Chapter 19 Sections: 1, 5, 6, 8, 9, 10
Chapter 20 Sections: 2, 4, 5, 6, 7, 8, 9

7. What is Color? Chapter 19 Sections: 1, 5, 6, 8, 9, 10

8. Chapter 19 Sections: 1, 5, 6, 8, 9, 10
Chapter 20 Sections: 2, 4, 5, 6, 7, 8, 9

9. How Can Light Be Used?
Laser: device that produces a very powerful intense beam of same color light.
Uses
Medicine
Industry
Military
Fiber optics

10. How Fiber Optics Work
Fiber optic cable
Location A
Location B

11. What is an Electric Charge?
Electricity is the flow of negative charges from a place of higher concentration to a lower concentration. + + + + + + + +

12. Electric Battery Batteries are made using
1) + Electrode ) – Electrode ) Electrolyte
+ carbon
electrode
- zinc
electrode
+ copper
electrode
- zinc
casing
Electrolyte
(acid or base)
Moist
paste

13. Electric Current Types
Direct Current (DC)
Current flows one way.
Electric current found in dry cells.
Alternating Current (AC)
Constantly changes direction at a constant rate.
Advantage is that it can be sent over long distances.
Voltage can be
increased / decreased

14. Series Circuit A circuit needs three things.
Energy source
Path
Load
Series circuit: circuit in which current only flows in one direction. - - - - -

15. Parallel Circuit
Parallel circuit- circuit in which electric current can follow more than one path.

16. Measure Electricity
Voltage: energy that is available to push electrons through the path.
Measured in volts (V) by a voltmeter.
Current: amount of electric current.
Measured in amps (A) by an ammeter.
Resistance: material that resists the flow of electricity.
Measured in ohms (Ω).
Length, diameter, material, and temperature affect amount of resistance.

17. Voltage = 6 amps × 10 Ω Voltage = 60 Volts
Ohm’s Law: current in a wire is equal to the voltage divided by the resistance.
Voltage = 6 amps × 10 Ω
Voltage = 60 Volts
6 A - - -
2 Ω
3 Ω
5 Ω - - - - -
6 A