# Basic House Wiring.

## Presentation on theme: "Basic House Wiring."— Presentation transcript:

Basic House Wiring

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)

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

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

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

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

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

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)

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

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

Basic Electrical Relationship
Ohm’s 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) I R

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

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

Long Nose Pliers Back

Lineman’s Pliers Back

Side Cutters Back

Tin Snips Back

Wire Stripper/Cutter Back

Cable Ripper Back

Fuse Puller Back

Fish Tape Back

Conduit Bender Back

Receptacle Analyzer Back

Voltage Tester Back

Continuity Tester Back

Multimeter Back