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Introduction to Electricity

Explore crucial electricity terms, such as Amps and Volts, circuit components like fuses and breakers, and practical applications of electrical formulas and devices. Learn about GFCIs, circuit types, and safety standards for household wiring.

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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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