Chapter 12

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  1. Direct current (DC)
    Current in which charged particles travel through a circuit in only one direction

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  2. Alternating current (AC)
    • A current in which the electrons move back and forth in a circuit
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  3. Transformer
    An electrical device that changes the size of the potential difference of an alternating current

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  4. Circuit breaker
    A safety device that is placed in series with the other circuits that lead to appliances and other outlets

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  5. Fuse
    A safety device that is found in older buildings and some appliances; like a circuit breaker, it is placed in series with other circuits that lead to appliances and other outlets 

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  6. Electrical power
    The rate at which an appliance uses electrical energy

  7. Watt (W)
    A unit of electrical power; 1 kilowatt = 1000 W

  8. Kilowatt (kW)
    The practical unit of electrical power; 1 kW = 1000 W

  9. Electrical energy
    The energy that is used by an appliance at a given setting; is determine by multiplying its power rating by the length of time it is used

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  10. Kilowatt-hour (kWh)
    The practical unit of electrical energy

  11. EnerGuide label
    A label that gives details about how much energy an appliance uses in one year

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  12. Smart meter
    A meter that records the total electrical energy used hour by hour and sends the information to the utility company automatically

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  13. Time of use pricing
    A system of pricing in which the cost of each kW⋅h of energy used is different at different times
  14. Phantom load
    The electricity that is consumed by an appliance or device when it is turned off

    E.g. Digital video recorders, Computer, Chargers for phones and electronics

  15. Efficiency
    The ratio of useful energy output to total energy input expressed as a percentage

  16. Base load
    The continuous minimum demand for electrical power

  17. Hydroelectric power generation
    The production of electricity using a source of moving water

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  18. Intermediate load
    A demand that is greater than base load and is met by burning coal and natural gas

  19. Peak load
    the greatest demand for electrical energy, met by using hydro and natural gas

  20. Renewable energy source
    A source of energy that can be replaced in a relatively brief period of time

    E.g. Solar energy
Card Set
Chapter 12
Science chapter 12
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