Resistance.txt

Card Set Information

Author:
kariefury
ID:
28554
Filename:
Resistance.txt
Updated:
2010-07-31 18:32:57
Tags:
Physics Electricity Voltage Resistance Current
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Description:
Ohm's "Law"
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  1. What is grounding?
    Provide pathway for extra electrons to leave
  2. What does an Ammeter measure?
    I current (amps)
  3. What are the component units of Amperes?
    Coulombs / Sec
  4. Current equals…
    ΔQ/Δt
  5. Why does the current stop increasing?
    Resistance in the circuit
  6. What is the symbol for resistivity?
    ρ Rho
  7. What is the symbol for ResistANCE?
    R
  8. What is the ResistANCE for a wire?
    ρL/A
  9. When do you get maximum resistANCE for a wire?
    • Large L, Small A
    • R=ρL/A, Hot Wire
  10. As the temperature of a conductor increases what happens to resistivity?
    Increases
  11. What are the conditions for minimum resistANCE for a wire?
    • small L, Large A
    • R=ρL/A, Cold Wire
  12. What is Ω?
    Omega, Unit for Ohms
  13. What is q/Δt?
    Current, I
  14. What is power?
    Work/Time
  15. What is I/R equal to?
    Voltage
  16. What is I2R equal to?
    Power = Current2 times Resistance
  17. What is IV equal to?
    Power = Current times Voltage
  18. What is V2/R equal to?
    Power = Voltage2 / Resistance (Joules, Watts / Second)
  19. What is a kilowatt hour equal to?
    3.6 x 106 J

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