Electricity Chapter 12

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  1. Direct current (DC)
    A type of current in which charged particles travel through a circuit in only one direction from negative to positive.
  2. Alternating current (AC)
    A type current in which the electrons move back and forth in a circuit with no net movement.
  3. Transformer
    An electrical device that changes the size of the potential difference of an alternating current. 

    E.G Step up transformer or Step down transformer Image Upload
  4. Circuit breaker
    A safety device that is placed in series with the other circuits that lead to appliances and other outlets which can break circuits.
  5. Fuse
    A safety device found in older buildings similar to a circuit breaker, it is placed in series with other circuits that lead to appliances and other outlets.
  6. Electrical Power
    The rate at which an appliance uses electrical energy.
  7. Watt (W)
    A unit of electrical power.

    E.G 1 kilowatt = 1000 W
  8. Electrical energy
    The energy that is used by an appliance at a given setting. It is determine by multiplying its power rating by the length of time it is used for.
  9. Kilowatt-hour (kW∙h)
    The practical unit of electrical energy. Used for applicances etc.
  10. EnerGuide label
    A label that gives details about how much energy an appliance uses in one year.

    EG. On a refrigerator etc.Image Upload
  11. Smart meter
    A meter that records the total electrical energy used hour by hour and sends the information to the utility company automatically. Found in newer homes.
  12. Time of use pricing
    A system of pricing in which the cost of each kW⋅h of energy used is different at different times.
  13. Phantom load
    The electricity that is used by a device when it is off. 

    EG. A computer monitor.
  14. Efficiency
    The ratio of useful energy output to total energy input expressed as a percentage.
  15. Base load
    The  minimum demand for electrical power.
  16. Hydroelectric power generation
    A generating station which uses a source of moving water to generate AC electricity.
  17. Intermediate load
    A demand that is slightly greater than base load and is met by burning coal and natural gas.
  18. Peak load
    The highest demand for electrical energy, met by using hydro and natural gas.
  19. Renewable energy source
    A source of energy that can be replaced in a relatively brief period of time.

    EG. Wind energy, solar energyImage Upload
  20. Biomass energy
    Organic materials that can be used as a source of fuel.

    EG. Forest wood
  21. Solar energy
    Energy that is radiated from the Sun outward towards the Earth.
  22. Photovoltaic effect
    The generation of an electrical current when certain materials are exposed to light
Card Set:
Electricity Chapter 12
2014-04-15 02:37:00
Science electric
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