electricity 2

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electricity 2
2012-10-31 18:56:09

chapter 11
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  1. Electric circuit
    A closed path along which electrons that are powered by an energy source can flow. 
  2. Voltaic cell
    A source of energy that genreates an electric current
  3. Battery
    A connection of two or more cells
  4. Electrode
    one of two metal terminals in a cell or battery
  5. electrolyte
    a solution or paste that conducts charge
  6. dry cell
    a cell that contains an electrolyte made of a paste
  7. wet cell
    A cell that contains a liquid electrolyte 
  8. primary cell
    A cell that can be used only once
  9. Secondary cell
    A cell that can be recharged
  10. Fuel cell
    A cell that generates electricity through the chemical reactions of fuel that is stored outside the cell
  11. Solar cell
    A cell that converts sunlight into electrical energy
  12. Terminal
    A position on a cell that must be connected to other components to form a circuit
  13. Switch
    A control device that can complete or break the circuit to which it is connected
  14. Open circuit
    • A circuit that contains a gap or break
    • Happens if the switch is open 
  15. Electric current
    • The measure of charged particles that pass by a point in an electric circuit each second
    • Measured with an ammeter in ampheres (A)
  16. Coulomb (C)
    the quantity of charge that is equal to the charge of 6.25 x 10^18 electrons
  17. Amphere (A)
    The unit of electric current, equivalent to one coulomb per second
  18. Electrical resistance
    The property of a substance that hinders electric current and converts electrical energy to other forms of energy
  19. Resistor
    A device used in an electric circuit to decrease the current through a component by a specific amount
  20. Load
    A resistor or any other device that transforms electrical energy into heat, motion, sound or light
  21. Potential Difference (voltage)
    the difference between the electric potential energy per unit of charge at two points in a circuit
  22. Volt
    The unit for potential difference equivalent to one joule (J) per coulomb (C)
  23. Circuit diagram
    A diagram that uses standard symbols to represent the componenets in an electric circuit and their connections
  24. Series circuit
    A circuit in which there is only one path along which electrons can flow
  25. Parallel circuit
    A circuit in which there is more than one path along which electrons can flow
  26. Ohm's Law
    The ratio of potential difference to current is a constant called resistance
  27. Ohm (Ω)
    • The unit for resistance equivalent to one volt per amphere 
    • ( V/A )
  28. Superconductor
    A material through which electric charge can flow with no resistance
  29. Non-ohmic
    not following Ohm's law
  30. Load in series
    Loads that are all connected together to the same wires

    •  Rtotal = R1 + R2 + R3
    •  I total = I1= I2 = I3
    • V total = V1 + V2 + V3
  31. Loads in parallel
    Loads that are not all connected to the same wire , and there is more than one path which electrons can flow

    • VT = V1 = V2 = V3
    • IT = I1 + I2 + I3
    • RT < R1 ; RT < R2 ; RT