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Introduction to Electricity

Introduction to Electricity. By: Mr. Brock. Terms. Electricity- Source of energy that can be easily converted into light, heat or power Ampere (Amp)- Unit of measure of the rate of flow of electricity through a wire Volt- unit of measure of electrical pressure. Electricity. Terms.

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Introduction to Electricity

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  1. Introduction to Electricity By: Mr. Brock

  2. Terms • Electricity- Source of energy that can be easily converted into light, heat or power • Ampere (Amp)- Unit of measure of the rate of flow of electricity through a wire • Volt- unit of measure of electrical pressure

  3. Electricity

  4. Terms • National Electrical Code- handbook that sets the minimum standards for electrical wiring (Revised every 3 years) • Underwriters Laboratory (UL)- a laboratory that tests electrical wiring materials. A UL stamp ensures the product meets the minimum safety standards.

  5. National Electrical Code

  6. Terms • Circuit- complete path through which electricity flows; from power source to lamp and back to source • Fuse- safety device which burns through when current becomes too great • Circuit Breaker- safety device that trips rather than burning

  7. Terms • Conductors- wires through which electricity flows • Service Entrance Panel (SEP)- panel located inside the house from which every circuit branches • Ground Fault Circuit Interrupter- protects form shock, can be installed at SEP or on receptacle

  8. SEP and GFCI

  9. Terms • Branch Circuit- circuit between last breaker and one or more outlets • Feeder Circuit- circuit between the SEP and the fuse or circuit breaker protecting a branch circuit • Conduit- thin walled steel pipe used to protect electrical wires • Short Circuit- improper connection between the hot and neutral wires or between hot wires

  10. Conduit

  11. GFCI • The trip level of a GFCI is between 4 and 6 milliamps (thousandths of a amp) • GFCI disconnects in as little as 1/40th of a second • GFCI disconnects circuits in situations where a breaker or fuse would not

  12. Places where GFCI’s are required • 1) Within 6 feet of a sink • 2) In garages except where not accessible • 3) Unfinished basements • 4) Crawl Spaces • 5) Boathouses • 6) Bathrooms

  13. GFCI

  14. 2 Types of Circuit Breakers • Single Pole- used for 120 circuits • Double Pole- used for 240 circuits

  15. Things that operate on a 120 volt circuit • Most kitchen appliances • Ex: toaster, blender, garbage disposer, dish washer, freezer, refrigerator • Clothes Washer • Portable Heater • Hair Dryer • Electric Drills • Lamps • Electric Razor

  16. Things that operate on 240 • Air conditioner • Large Water Heater

  17. 240

  18. Formula for Watts, Volts and Amps • Watts= Volts x Amps • Volts= Watts Amps • Amps= Watts Volts

  19. Examples • 100 watts and 120 volts, How many Amps? • 0.83 • 120 volts and 2 amps, How many Watts? • 240 • 1 amp and 115 watts, How many Volts? • 115

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