Physics Grade 9

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Physics Grade 9
2013-04-07 19:37:11

Electric Circuits
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  1. Electric Circuit
    A closed path along which electrons that are powered by an energy source that can flow.
  2. Voltaic Cell
    A source of energy that generates an electric current by chemical reactions involving two different metals or metal compounds separated by a solution that is a conductor. 
  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 a paste electrolyte.
  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. Circuit Diagram
    A diagram that uses standard symbols to represent the components in an electric circuit and their connections.
  13. Series Circuit
    A circuit in which there is only one path along which electrons can flow.
  14. Parallel Circuit
    A circuit in which there is more than one path along which electrons can flow. 
  15. Terminal
    Location on a cell that must be connected to other components to form a circuit. 
  16. Switch
    A control device that can complete or break the circuit to which it is connected.
  17. Open Circuit
    A circuit that contains a gap or break.
  18. Electric Current
    The rate of movement of electric charge.
  19. Coulomb (C)
    The quantity of charge that is equal to the charge of 6.35 x 10^18 electrons. 
  20. Ampere (A)
    The unit of electric current, equivalent to one coulomb per second. 
  21. Electrical Resistance
    The property of substance that hinders electric current and converts electrical energy to other forms of energy.
  22. Resistor
    A device used in an electric circuit to decrease the current through a component by a specific amount.
  23. Load
    A resistor or any other device that transforms electrical energy into heat, motion, sound or light.
  24. Potential Difference (voltage)
    The difference between the electrical potential energy per unit of charge at two points in a circuit. 
  25. Volt
    The unit for potential difference, equivalent to one joule (j) per coulomb (c). 
  26. Ohm's Law
    The ratio of potential difference to current is a constant called resistance.
  27. Ohm ()
    The unit for resistance, equivalent to one volt per ampere (V/A).
  28. Superconductor
    A material through which electrical charge can flow with no resistance. 
  29. Non-Ohmic
    Not following Ohm's law.