Chapter 12 Science

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Chapter 12 Science
2014-11-04 11:38:26
Ms Day Science

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  1. Direct Current (DC)
    DC (direct current) is the unidirectional flow or movement of electric charge. 

    • -It only flows in one direction unlike AC current 
    • Related Terms:

    • -Alternating current (AC)
    • -Transformers
  2. Alternating Current (AC)
    AC is an electric current that reverses its direction many times a second at regular intervals

    • -It flows in different direction unlike DC 
    • Related Terms:

    • -Direct Current (DC)
    • -Transformers
  3. Transformer
    An apparatus for reducing or increasing the voltage of an alternating current.

    • -Used for distributing electricity to homes
    • -Used for transportation of energy in general by Alternating Current 
    • - Used to decrease the voltage 
    • -Used to increase voltage

    • Related Terms:
    • - Alternating Current
  4. Circuit Breaker
    An automatic device for stopping the flow of current in an electric circuit as a safety measure.

  5. Fuse
    A safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level.

  6. Electrical power
    Electric power is the rate at which electric energy is transferred by an electric circuit

    • Related Terms:
    • -Watt
  7. Watt (W)
    The unit is defined as joule per second and can be used to express the rate of energy conversion or transfer with respect to time.

    • Related Terms:
    • -Joule
  8. Kilowatt (kW)
    The kilowatt hour, or kilowatt-hour, (symbol kWh, kW. · h, or kW h) is a unit of energy equal to 1,000 watt-hours, or 3.6 megajoules.

    • Related Terms:
    • -Watt
    • -Joules
  9. Electrical energy
    Electrical energy can be used to move charged particles through a wire from a power plant to our homes and businesses.

     - energy made available by the flow of electric charge through a conductor

    Related Terms:
  10. Kilowatt-hour (kW∙h)
    • One kilowatt-hour is defined as the energy consumed by power consumption of 1kW during 1 hour:
    • 1 kWh = 1kW · 1h
    • One kilowatt-hour is equal to 3.6·106 joules:
    • 1 kWh = 3.6·106 J
    • The energy E in kilowatt-hour (kWh) is equal to the power P in kilowatts (kW), times the time t in hours (h).E(kWh) = P(kW) · t(h)
  11. EnerGuide label
    The EnerGuide label is a tool to help you make an energy-wise choice when buying a new appliance. It shows how much energy appliances consume in a year of normal service (measured in kWh)

    • Related Terms:
    • -Kilowatt-hour
  12. Smart Meter
    A smart meter is usually an electronic device that records consumption of electric energy in intervals of an hour or less.

    -All houses and building have these in Kitchener 

    • Related Terms:
    • -Kilowatt-hour
  13. Time of Use Pricing
    Time-based pricing includes fixed time-of use rates for electricity.

    • Related Terms:
    • -Kilowatt-hour
    • -smart meter
  14. Phantom load
    Phantom load, or leaking electricity, refers to the electric power consumed by electronic and electrical appliances while they are switched off or in a standby mode.

    -Applies to anything that has a clock on it or some kind of energy consumer like an LED
  15. Efficiency
    Energy efficiency is a way of managing and restraining the growth in energy consumption.

    • Related terms:
    • -Smart Meters
  16. Base load
    The constant or permanent load on a power supply.

    • -Minimum requirement 
    • -Nuclear power plants supply base load
    • -Hydroelectric
  17. Hydroelectric power generation
    Hydropower is electricity generated using the energy of moving water.

    -Also supplies base load