FUND 2 General Class Notes

• What is a pole?

  How many paths there are for electricity to take
• What is a throw?

  An action. The number of throws tells you how many actions take place
• What is a Single Pole Single Throw switch?

  only 1 pathway for electricity to take
• What is a Double Pole Single Throw switch?

  2 possible paths to take, but only one action needed (paths are connected by a throw). It is used to control 2 separate circuits simultaneously
• What is a Single Pole Double Throw switch?

  Also known as a 3-way switch. By using the switch, you are able to control lights from 2 locations
• What is a Four-Way switch?

  Switch used to control load from 3 or more locations (used alongside 2 3-way switches)
• The neutral wire/identified conductor controls the ____ path

  return
• Can you put more information into a higher frequency or lower frequency?

  Higher (also has more radiation)
• Which colours make up white?

  It is roughly a blend of the 3 primary colours: blue, green and red
• What is colour temperature?

  Measurement of light quality
• What affects sight?

  size, brightness, contrast and time
• what is lumen efficacy?


  Lumens / watt (output compared to input)
• What is the purpose of the manufacturing catalogue?

  Tells us information about the light bulbs (ex. which ones work with different luminaires)
• Conductors have a _____ temperature coefficient

  positive....As they heat up, resistance increases
• Insulators and semi-conductors have a ____ temperature coefficient

  negative....As we heat them, resistance goes down (current goes up)
• LEDs run on ____ voltage

  extra-low
• What are 2 of the most common semi-conductors?

  Germanium and silicone
• Which bulbs use a PN junction?

  LEDs
• Cathode is ____ charged, and Anode is ____ charged

  negative, positive
• Converting from SMA to CMA always results in a ___ number

  higher. And vice versa
• The higher the temperature the conductor gets, the ____ the resistance it has

  Higher
• The lower the temperature the conductor gets, the ____ the resistance it has

  lower
• Wire insulation should last how long?

  At least 100 years (lifetime of building)
• If a conductor has a lower temperature rating, it can handle a lower ____

  current level
• The service conductors bring power from _____ to _____

  hydro/service to distribution centre
• The distribution brings power from ____ to _____

  distribution centre panel to sub-panels/load centres
• The branch conductors bring power from ____ to ____

  sub-panels to loads
• What is a ballast?

  Device that limits the current through an electrical circuit (controls how much current gets to load)