Electricity 3

  1. Direct Current (DC)
    Current in which particles travel through a circuit in only one direction
  2. Alternating Current (AC)
    A current in which electrons move back and forth in a circuit
  3. Transformer
    An electric device that changes the size of the potental difference of an alternating current
  4. Circuit breaker
    A safety device that is placed in series with other circuits that lead to appliances and outlets
  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 outlets 
  6. Electrical power
    The rate at which an appliance uses electrical energy
  7. Watt (W)
    • A unit of electrical power 
    • 1 kilowatt = 1000W
  8. Kilowatt (kW)
    • A practical unit of electrical power
    • 1kW = 100 W
  9. Electrical energy
    the energy that is used by an appliance at a given setting; is determined by multiplying its power rating by the length of time it is used
  10. Kilowatt-hour
    the practical unit of electical energy
  11. EnerGuide label
    A label that gives details about how much energy an appliance uses in one year of normal use


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  12. Smart meter
    A meter that records the total electrical energy used hour by hour and sends this 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 x h of energy used is different at different times of the day
  14. phantom load
    The electricity that is consumed by an appliance or device when it is turned off
  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
  18. Intermediate load
    A demand for electricity that is greater than the base load and is met by burning coal and natural gas
  19. Peak load
    The greatest demand for electricity, which is met by using hydroelectric power and natural gas
  20. Renewable energy source
    A source of energy that can be replaced in a relatively brief period of time
  21. Non- renewable energy source
    A source of energy that cannot be replaced as quickly as it is used
  22. Solar energy 
    energy that is directly converted from the energy of the Sun into electricity
  23. Photovoltaic effect
    The generation of a direct current when certain materials are exposed to light
  24. Biomass energy
    Energy that is generated from plant and animal matter
Card Set
Electricity 3
chapter 12