1. Home Electrical Systems

2. Behavior Objectives  Define the basics of Electrical Systems  Explain the basic principles of Electricity.  Describe the different materials used in Home Electrical Systems.

3. Wiring  Electrical wiring is one of the three installations including plumbing, hearing,and air conditioning.  Electrical wiring consists of wires, boxes, and devices that control the distribution and use of electricity. (wires, boxes, switches)

4. Wiring  Electrical wiring powers lights, heating units, and appliances such as refrigerators, ovens and washing machines.

5. Wiring Safety  Personal contact could cause serious injury or even death.   An electrical short may cause a fire.

6. Wiring This is why installation requires professional installation.

7. Equipment and Materials  Conductors – These are the wires that carry current from the source.  Boxes and Covers – Covers, conceal and protect devices, such as switches and receptacles, placed in boxes in boxes.  Switches – Switches control the current to lights and appliances

8. Equipment and Materials  Fuses and Circuit Breakers – Protect conductors from overloads, shutting off power to the circuit in case of a fault in the circuit or a too-heavy current draw that would heat up the wire and cause it to fail.  Receptacles (outlets) – Allows convenient connection of appliances and lights to a circuit.  Conduit – Pipes or enclosed channels through which conductors are run  Connectors – Secure connections between two or more conductors and conduit.

9. Electricity  Electricity – is the flow of electrons in a conductor. (measured in amps)  Electrical Current – the force applied in order to achieve the flow of electrons.

10. Electricity  Direct Current – Current flows in one continuous direction. (ex. Battery)  Alternating Current – The process of rapidly changing the direction of voltage. (ex. Home circuits)

11. Services  Substation – a series of transformers that step down voltage before it is delivered to a large number of customers.  Step-Down Transformer – Each building has a step-down transformer to further step down the voltage.

12. Electrical Circuits Electrical Circuit – a complete path for current to flow.Electrical Circuit – a complete path for current to flow. Source – provides the electric energy to the circuit.Source – provides the electric energy to the circuit. Conductor – the path for the electric energy.Conductor – the path for the electric energy. Load – Utilizes the current to perform a useful purposeLoad – Utilizes the current to perform a useful purpose Control Device – A device used to perform a certain task.Control Device – A device used to perform a certain task.

13. Electrical Circuits

14. Wires Wires – Power (Red or Black) Neutral (white) Neutral (white) Bare (ground) Bare (ground)

15. Place the correct word that goes with the definition. 1.___________ These are the wires that carry current from the source. 2.___________ This item conceals and protects devices, such as switches and receptacles, placed in boxes in boxes. 3. __________ This item controls the current to lights and appliances. 4. __________ Allows convenient connection of appliances and lights to a circuit. 5. __________ Pipes or enclosed channels through which conductors are run. 6. __________ Secure connections between two or more conductors and conduit. 7. __________ is a complete path for current to flow. 8. __________ is a series of transformers that step down voltage before it is delivered to a large number of customers. Recording your Knowledge Conductors Conduit Boxes and Covers Connectors Switches Electrical Circuit Receptacles Substation