Residential Electricity

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Residential Electricity

• Power to the People

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Current

• Electrical current is the flow of electrons in a
  circuit. (like the water flowing through a hose)
• Measured in amps
• DC Direct current (car battery)
• AC Alternating Current (homes)

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Tools

• pliers
• screwdrivers
• utility knives
• wire stripers

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Lets get BUSY!
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Voltage

• Potential energy difference in a circuit.
• Measured in volts
• (like the pump pushing the water through the hose)

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Resistance

• The measure of opposition to current flow within
  a circuit.
• Measured in ohms
• (like the friction in the hose as the water flows
  through it )

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Conductor

• Material that allows the flow of electrons easily
• Examples metals such as copper and aluminum

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Insulator

• Material that opposes the flow of electrons
• Examples Ceramics, glass

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The Power Grid

• Electrical power is like the air we breatheyou
  dont really think about it until it is missing
• Think about last summers power failure

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We need power for.

• Heating Lighting
• Cooling Computing
• Cooking Controls
• Refrigeration Entertaining

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Power Distribution Grid

• Hydro power travels from the power plant to your
  home through a system called the distribution grid

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The Grid
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The Power Plant

• Hydroelectric plant
• Dam
• Waterfalls
• River
• Tidal

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The Power Plant

• Fuel Powered
• Diesel
• Gas Turbine
• Coal Fired
• Nuclear Reactor

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The Power Plant

• In all almost all cases the power plant consists
  of a spinning electrical generator

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Hydroelectric Power Plant
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Three-phase Power

• Power plants produce
• 3-phase power
• Each surge of power is offset 120o

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Single-phase Power

• Homes run on only one of these three phases

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At the House

• The high voltage (7200volts) in the distribution
  grid must be transformed to 240volts for use in a
  residence.

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The Transformer
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240v Electricity

• Three wires enter the home.
• One bare wire (ground).
• Two Insulated wires each carrying 120v (180o out
  of phase)

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240v Electricity
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Hydro Meter

• Utility companies charge for the amount of
  electricity that you use

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Service Panel

• Main Breaker
• Bus bars (2 line, 1 neutral)
• Fuses or circuit breakers
• Separates into circuits
• 110 and 220 volts circuits

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Electrical Devices

• Duplex receptacle
• Appliances
• Lights

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Duplex Outlet

• Neutral Line
• white wire black wire
• Ground
• bare copper

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Continuity

• These three wires must run in a continuous
  circuit.
• white wires attach to white (silver screws)
• black wires attach to black (brass screws)
• ground wires attach to ground wires (green
  screws)

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Install an Outlet

• Our first device we will install is the duplex
  receptacle.