EPower 1

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Author:
cdeelah
ID:
127870
Filename:
EPower 1
Updated:
2012-01-16 13:29:03
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Chapter terms
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Chapter 1 terms
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  1. Alternating Currenty (AC)
    • Current that reverses direction at a regular rate. Alternating voltage reverses in polarity.
    • The rate of reversals is the frequency.
  2. Ampere
    The basic unit of current. 1A = 1C/1s or 1A = 1V/1(ohm sign, the horse shoe thing)
  3. Atom
    The smallest particle of an element that still has the same characteristic as the element.
  4. Atomic Number
    The number of protons, balanced by an equal number of electrons, in an atom.
  5. Circuit
    A path for current flow
  6. Compound
    A combination of two or more elements
  7. Conductance (G)
    • Ability to conduct current.
    • It is the reciprocal of resistance, G=1/R. The unit is the siemens (S)
  8. Conductor
    Any material that allows the free movement of electric charges, such as electrons, to provide an electric current.
  9. Conventional Current
    • The Direction of current flow associated with positive charges in motion.
    • The current flow direction is from a positive to a negative potential, which is in the opposite direction of electron flow.
  10. Coulomb (C)
    • Unit of electric charge.
    • 1C = 6.25 x 10^18 electrons
  11. Current
    A movement of electric charges around a closed path or circuit
  12. Dielectric
    • An insulating material, such as glass, plastic, rubber, paper, air, or mica.
    • It can store electric charge.
  13. Dielectric Strength
    The ability of a dielectric to withstand a potential difference without internal arcing.
  14. Dielectric Material
    Insulating material. It cannot conduct current but does store charge.
  15. Dielectric Constant
    Ability to concentrate the electric field in a dielectric
  16. Dielectric Absorption
    • The inability of a capacitor to completely discharge to zero.
    • Dielectric absorption is sometimes called battery action or capacitor memory.
  17. Direct Current (DC)
    • Current that flows in only one direction.
    • DC voltage has a steady polarity that does not reverse.
  18. Electron
    Basic particle of negative charge in orbital rings around the nucleus in an atom.
  19. Electron Flow
    • Current of negative charges in motion.
    • Direction is from the negative terminal of the voltage source, through the external circuit, and returning to the positive side of the source. Opposite to the direction of conventional current.
  20. Electron Valence
    The number of electrons n an incomplete outermost shell of an atom.
  21. Element
    A substance that cannot be decomposed any further by chemical action
  22. Free Electron
    Electron that can move freely from one atom to the next.
  23. Insulator
    A material that does not allow current to flow when voltage is applies, because of its heigh resistance.
  24. Ion
    • Atom or group of atoms with net charge.
    • Can be produced in liquids, gases, and doped semiconductors.
  25. Molecules
    The smallest unit of a compound with the same chemical characteristics.
  26. Neutron
    Particle without electric charge in the nucleus of an atom.
  27. Nucleus
    The massive, stable part of the atom which contains both portions and neutrons.
  28. Ohm
    Unit of resistance. Value of one ohm allows current of one ampere with potential difference of one volt.
  29. Potential Difference
    • Ability of electric charge to do work in moving another charge.
    • Measured in volt units.
  30. Proton
    Particle with positive charge in the nucleus of an atom.
  31. Resistance (R)
    • Opposition to current.
    • Unit is the ohm
  32. Semiconductor
    A material which is neither a good conductor nor a good insulator.
  33. Siemens (S)
    Unit of conductance. Reciprocal of ohms unit.
  34. Static Electricity
    Electric charges not in motion.
  35. Volt (V)
    • Practical unit of potential difference.
    • One volt produces on ampere of current in a resistance of one ohm. IV=IJ/IC

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