1. ELECTRICAL CIRCUITS
All you need to be an inventor is a good imagination and a pile of junk.
-Thomas Edison

2. The unit for the rate of current is the ampere or amp
Electric current
Electric Currents is The rate at which electrons pass through a wire at a given point
To produce a current, electrons need to move continuously from one place to another.
The unit for the rate of current is the ampere or amp

3. High current
The higher the current, the greater the number of charges that pass through the point each second
CURRENT

4. Low current
The lower the current, less charges that pass through the point each second
CURRENT

5. I Love Lucy shows us how current works!
Current example…
I Love Lucy shows us how current works!
I Love Lucy

6. Current example… electric, current, circuit, high, low
Talk with a partner:
What is electric current?
When was the current the slowest in the movie?
When was the current the fastest in the movie?
Words I want to hear in your conversations:
electric, current, circuit, high, low

7. All simple circuits need three basic parts:
An energy source
Wires
A load

8. Load The load changes electrical energy into other forms of energy
These other forms might include thermal energy, light energy, or mechanical energy
Look at Figure 1 on the bottom of page What are examples of loads in the picture?
Light bulbs
Appliances
Televisions
Motors

9. Energy source Look at Figure 1 on page 436.
The energy source is what gives the circuit its energy or power
What are examples of energy sources?
Batteries
Photocells
Thermocouples
Electric generator at a power plant

10. Batteries
Batteries use chemical energy to generate electrical energy for an electric circuit.

11. Photocells
Photocells use the sun’s light (solar energy) to generate electrical energy for an electric circuit

12. Electric generator at a power plant
Every time you plug something into an outlet, chances are that the electricity was generated at a coal-powered power plant!

13. A complete, unbroken path through which electric charges can flow
Electric circuit
A complete, unbroken path through which electric charges can flow
If the circuit is broken, the charges can’t flow continually!

14. ELECTRICAL CIRCUITS
Open Circuit: leaves gaps in a circuit preventing electrons from traveling from one side of the power source to the other. Thus, no current will flow.
Point of open
In this circuit the lamp will not illuminate because there is no complete pate for current to flow.

15. Electric circuit
A closed circuit (on) switch means that there is no gaps in the circuit allowing the electrons to flow through the entire circuit.
Thus, you have a closed circuit (a circuit with no gaps in it). Current flows from the positive side of the power source wired into the circuit and back to the negative side of the power source.

16. A Switch to Control a Circuit
A switch is used to open and close a circuit
For charges to flow through a circuit, the switch must be closed, or turned “on”
When the switch is open, or “off,” the loop of the circuit is broken.
Charges cannot flow through a broken circuit.
Light switches, power buttons, and even keys on calculators can open and close circuits.