1. T3t1 Electrical circuits
Gr. 6
2015

2. Key words
Electric circuit
A system that transfers electrical energy from the source to where it is needed.
Electrical current
The electrical charge that flows through a circuit.

3. Cell
Battery

4. Key words Battery A number of cells connected together. Switch
Controls the flow of electricity in a circuit. It can switch the current on or off.
Input devices
A cell or battery that makes the charges flow.
Process devices
Component that controls the flow of charges, for example the switch.
Output devices
Components that changes the electrical energy into useful energy, for example a light bulb.

5. Light bulb = Output device Switch = Process device
Copy
Light bulb = Output device
Switch = Process device
Battery = Input device

6. Open circuit
An electrical circuit that does not allow charges to flow.
Closed circuit
An electrical circuit that allows charge to flow.
Open circuit
Closed circuit

7. Electric charge (Copy)
All matter (solids, liquids and gasses) are made up of particles, called atoms.
Some of these particles have a positive or negative charge.
Charges attract or repel each other.
Like charges (the same) repel each other, while unlike (not the same) charges attract.
Wires in a circuit are made of metal, these wires have charges that can move, because metal is a good conductor of electricity.
We can make these charges move in the same direction, we call this the flow of electricity through the wires.

8. Circuits (Copy) All electrical circuits have 3 basic requirements:
1) A power source. (cell, battery or mains power).
2) Components that have to do something (for example a motor, light bulb, speaker).
3) Conducting wires that connect all the parts in the circuit.

10. Circuit diagrams (Copy)
Electrical symbols
Cell
Battery
Switch - closed
Switch - open

11. Connecting wires
Light bulb
Buzzer
Motors

12. You have 5min to do this assessment
Class assessment (on an extra piece of paper)
You have 5min to do this assessment
Draw the electrical symbol for:
An open switch
A motor
2) Label the following symbols: a) b)
3) Draw a closed circuit with a battery that has 2 cells and a buzzer.

13. Class assessment MEMO b) 2)
a) Light bulb
b) Cell

14. 3) Draw a closed circuit with a battery that has 2 cells and a buzzer.

15. Homework:
NS: Watch video: circuit diagrams.

16. Cell
Battery

17. How to draw a circuit diagram:
The output device is drawn opposite the input device.
Input device :
Output device :
The process device is drawn between the input and output devices.
Process device:
If the switch is closed the direction of the current can be indicated with an arrow on the diagram.
Electrical current always flows from positive to negative, through the circuit.
Cell or battery
Light bulb or motors
Switch

20. 4) 5)
Buzzer
Closed switch
Battery

21. Conductors and Insulators
A material that allows electricity to flow through it.
Insulator
A material that does not allow electricity to flow through it.

22. Discussion on figure 1
Discuss this picture by making reference to what you know about electrical safety and what you have learned about conductors and insulators.

23. Identify if the following items are conductors or insulators (Copy)
Iron key, plastic ruler, loomy band, copper wire, metallic screwdriver, piece of paper, silver coin and a cloth.
Conductors
Insulators
Iron key
Plastic ruler
Copper wire
Loomy band
Metallic screwdriver
Piece of paper
Silver coin
Cloth
Conductors
Insulators

24. Homework:
NS: Draw a mindmap