Back EMF Equation and Calculating A/C Starter Current | Homework Example

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SUMMARY

The discussion centers on calculating the start-up and operating current of an A/C starter using the back EMF equation. Given a 12V supply and a back EMF of 6V with a resistance of 0.1 ohms, the start-up current is calculated to be 120A, while the operating current is 60A. The equation used for these calculations is E=IR, where E represents voltage, I represents current, and R represents resistance.

PREREQUISITES
  • Understanding of Ohm's Law (E=IR)
  • Basic knowledge of electrical circuits
  • Familiarity with A/C systems and components
  • Ability to perform unit conversions and calculations
NEXT STEPS
  • Study the implications of back EMF in electric motors
  • Learn about the characteristics of A/C starter systems
  • Explore advanced circuit analysis techniques
  • Investigate the effects of resistance on current flow in electrical systems
USEFUL FOR

Electrical engineering students, automotive technicians, and anyone involved in the design or maintenance of A/C systems will benefit from this discussion.

Girn
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Homework Statement


An A/C starter has a 12V supply & a back EMF of 6V. If the resistance is 0.1 ohms, calculate current during start-up & while in operation

Homework Equations


E=IR
Not sure what else? Sorry I am stuck.

The Attempt at a Solution


Start up current
E=IR
12V=I x .01
I = 120A

operating current
6V=I x .01
I = 60A
 
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Girn said:
Start up current
E=IR
12V=I x .01
I = 120A

operating current
6V=I x .01
I = 60A
Looks correct.
 
Girn said:
An A/C starter has a 12V supply & a back EMF of 6V.
What is A/C[/color] an abbreviation for?
 

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