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Enterprise: Ag. Mechanics Job: Becoming Familiar with Electricity

Learn the basic terminology, parts, and concepts of electrical wiring and circuits, including volts, amps, and ohms. Plan an electrical circuit and understand the relationship between watts, amps, and volts.

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Enterprise: Ag. Mechanics Job: Becoming Familiar with Electricity

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  1. Enterprise: Ag. MechanicsJob: Becoming Familiar with Electricity

  2. ObjectivesWhat are we going to accomplish?Identify basic terminology, parts and pieces of electrical wiring and basic theoryDescribe the relationship of volts, amps, and ohms in terms of Ohm's LawPlan an electrical circuit

  3. Electrical Terminology • 1. Volts - measure of electrical pressure • 2. Amperes - measure of electrical volume • 3. Watts - measure of electrical useage • 4. Formula: Watts = Amps x Volts • 5. Kilowatt Hour - unit by which electricity is sold

  4. Electrical Terminology • 6. Circuit– an electrical source and two or more wires connected to a load such as a light, heater, or motor(similar to a circle) • 7. Open Circuit– a broken circuit which a current cannot flow through • 8. Short Circuit– when electricity flows through the circuit and back to its source too rapidly and blow fuses, burn wires, and drain batteries

  5. Electrical Terminology G S • 9. Switch - device used to control the flow of electricity.

  6. Electrical Terminology S G • 10. Three-way Switch - used to control the flow of electricity from two different locations.

  7. Electrical Terminology D G • 11. Duplex Receptacle - electrical outlet or plug-in.

  8. Electrical Terminology • 12. Ground Circuit Fault Interrupter (GFCI)– is a device that cuts off the electricity if even very tiny amounts of current leave the normal circuit.

  9. Electrical Terminology SOURCE J • 13. Junction - electrical box where the source connects to the cable 10. Wire Nut - device used to connect two or more wires =

  10. Electrical Terminology • 14. Cable - two or more insulated conductors (wires) encased in an outer covering. • a. sizes (big to small) - 2, 4, 6, 8, 10, 12, 14, or 16 gauge • b. colors - black, white, bare/green, red

  11. Wire Gauges

  12. Electrical Terminology • 11.  Black Wire - common, power, hot • solid line  • 12.  White Wire - neutral • dashed line • 13.  Ground Wire - safety (green or bare) • Waved Line • 14.  Red Wire - power, hot • Dash Dot

  13. Electrical Terminology • 15. Examples of Cables: • a. 12/2 = 12 gauge wires, 1 black, 1 white, and 1 bare ground (3 wires total) • b. 14/3 = 14 gauge wires - 1 black, 1 white, 1 red, and 1 bare ground (4 total)

  14. Power Generation At a hydroelectric plant, the massive kinetic force of elevated water that drops clown through a clam penstock in a controlled release turns giant turbines that generate electricity. Electrical current travels over high-voltage power lines to a step-clown utility transformer near your house.

  15. PowerTransmission The current then leaves the transformer, enters your home as available voltage for use (120-volt and 240-volt), and then returns to the transformer. It is transmitted to your main service-entrance panel (SEP) by means of two insulated hot conductors and a bare grounded neutral wire.

  16. House Entrance Power that enters your home must first flow through the utility company's electric meter to be measured.

  17. Service-Entrance Panel The electricity then goes to your service panel, where it is distributed to the various electrical circuits in your home. A 120/240-volt appliance, like a clothes dryer, needs two insulated hot wires, one insulated grounded wire, and one grounding conductor. A 120-volt duplex outlet needs an insulated hot wire, an insulated grounded wire, and a bare or green grounding wire. A 240-volt-only appliance needs just two insulated hot wires and a grounding wire.

  18. Electrical Terminology 16. Other a. a light fixture 17. Locate the amps and volts on the following shop tools or machines, then calculate watts: a. Drill Press d. Air Compressor b. 8” Bench Grinder e. Miter Saw c. Arc Welder f. Other? L

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