Electrical Quantities & Units

Card Set Information

Author:
cxcxcx
ID:
221074
Filename:
Electrical Quantities & Units
Updated:
2013-05-25 11:43:13
Tags:
Electrical Quantities Units Pocket
Folders:

Description:
Electrical Quantities & Units
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user cxcxcx on FreezingBlue Flashcards. What would you like to do?


  1. Determine the maximum number of electrons that can exist in the third shell of an atom?
    • ,
  2. Determine the magnitude of the voltage required to accelerate an electrons to a kinetic energy of 8 x 10^-15 joules?
  3. A car battery supplies a current of 50 A to the starter motor. How much charge passes through the starter in 1/2 minute?
  4. How many circular mils does a round copper rod of 0.25 inch diameter has?
  5. What is the size in square millimeter is the cable of 250 MCM size?
    • 250 MCM → 250000 CM

  6. A copper rod of 10m long has a diameter with one inch. If the resistivity of copper is 10.371 ohms circular-mil per foot, what is the resistance?
  7. Determine the resistance of a bus bar of copper if the length is 10 meters long and the cross section is a 4 x 4 cm. The resistivity is 1.724μohm-cm.


    • R
  8. A one meter rod of 2cm diameter is drawn until its resistance is 100 times the initial resistance. its length afterward is?
  9. A kilometer of wire having a diameter of 11.7 mm and a resistance of 0.031 ohm is drawn down so that its diameter is 5.0 mm. What does its resistance become?


  10. The resistance of the tertiary winding of a power transformer is 0.125 ohm at 25o C and the temperature coefficient of resistance at 25o C is 0.00393. What is the resistance at 65o C?


  11. The resistance of a transformer windings is 0.25 ohm at 250 C. When operating at full load, the temperature of the winding is 750 C. The temperature coefficient of resistance of copper at 00 C is 4.27 x 10-3 per degree centigrade. What is the winding resistance at full load?
    • α0 =  → T=1/α0

What would you like to do?

Home > Flashcards > Print Preview