# Resistance.txt

The flashcards below were created by user kariefury on FreezingBlue Flashcards.

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
 Author: kariefury ID: 28554 Card Set: Resistance.txt Updated: 2010-07-31 22:32:57 Tags: Physics Electricity Voltage Resistance Current Folders: Description: Ohm's "Law" Show Answers: