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Basic House Wiring. Electrical Measurement Terms Amp - measures the rate of flow of electrical current Volt - measure of pressure or force pushing electricity.

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Presentation on theme: "Basic House Wiring. Electrical Measurement Terms Amp - measures the rate of flow of electrical current Volt - measure of pressure or force pushing electricity."— Presentation transcript:

1 Basic House Wiring

2 Electrical Measurement Terms Amp - measures the rate of flow of electrical current Volt - measure of pressure or force pushing electricity Ohm - measure of electrical resistance Watt - basic measure of electricity (amps x volts = watts)

3 Other Basic Terms Ground - connector that runs between a device or circuit to safely conduct current to earth Conductor - device intended to carry electrical current Insulator - material that is a poor conductor of electricity; used to prevent electrical flow Short circuit - accidental connection between two conductors Overload - to run equipment in excess of its normal full load

4 Where does electricity come from? 1) Generation –Nuclear fission - split atoms –Hydro power - moving water –Burning fossil fuels - power plants 2) Step-up transformer –Voltage stepped up in transformer to between 69 and 345 thousand volts (sometimes even higher) 3) Transmission lines –Electricity travels through wires over long distances

5 Where does electricity come from? (continued) 4) Step-down transformer –Voltage stepped down in transformer at substation to between 2000 and volts 5) Distribution Lines –Electricity travels around community (sometimes above ground and sometimes below ground 6) Distribution transformer –Steps down voltage to between 120 and 240 volts for use in business or home 7) Customer line –Electricity enters homes or business

6 Circuit Path for electricity –Closed - electricity is allowed to flow –Open - electricity is stopped Many circuits within a home

7 Fuse/Circuit Breaker Boxes Each branch circuit is protected by fuses or circuit breakers If too much current is used, fuses or breakers will open the circuit –Fuse - if blown needs to be replaced –Circuit breaker - trips to open circuit; may be reset

8 Voltage Two wires carry 120 volts each –120 used for lights and small appliances (outlets) Two wires combined for 240 volts –240 volts used for large appliances (oven, dryer, hot water heaters, air conditioners)

9 Basic Electrical Tool Kit Screwdriver Long-nose pliers (similar to needle nose but has curved ends)Long-nose pliers Linemans Pliers Side Cutters - Diagonal-cutting pliersSide Cutters Tin Snips Wire Stripper/Cutter (Multipurpose tool)Wire Stripper/Cutter Cable Ripper Fuse Puller Fish Tape Conduit Bender

10 Testers Receptacle analyzer Voltage tester Continuity tester Multimeter (has specific settings to test all - voltage, amperage, and resistance)Multimeter

11 Basic Electrical Relationship Ohms Law –I = amperage (the flow of electrons) –R = resistance (resistance to the flow) –E (or V) = voltage (force behind electrons) –E = I x R E (or V) IR

12 Basic Skills for Replacing an Extension Cord End Use a wire ripper to slice cable sheathing Remove cable sheathing Use a wire stripper to remove insulation around each wire Make necessary connections –Hook wire clockwise over screws –Twist wire clockwise for wire nuts

13 Wire Identification Black wire - hot...electricity is brought to devices through this wire White wire - neutral...electricity goes back through this wire Bare Copper or Green wire - ground...safety for all stray electricity

14 Back Long Nose Pliers

15 Back Linemans Pliers

16 Back Side Cutters

17 Back Tin Snips

18 Back Wire Stripper/Cutter

19 Back Cable Ripper

20 Back Fuse Puller

21 Back Fish Tape

22 Back Conduit Bender

23 Back Receptacle Analyzer

24 Back Voltage Tester

25 Back Continuity Tester

26 Back Multimeter


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