Why Is My Calculation of Current in This Circuit Incorrect?

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SUMMARY

The discussion centers on calculating the current in an electrical circuit using Ohm's Law and equivalent resistance formulas. The user initially calculated a current of 0.65 Amps, which was incorrect. Participants emphasized the importance of correctly determining the total resistance using the formulas for resistors in series and parallel, specifically Req = R1 + R2 for series and 1/Req = 1/R1 + 1/R2 for parallel configurations. Accurate calculations of equivalent resistance are crucial for obtaining the correct current value.

PREREQUISITES
  • Understanding of Ohm's Law (v = IR)
  • Knowledge of equivalent resistance formulas for series and parallel circuits
  • Basic circuit analysis skills
  • Familiarity with resistor configurations
NEXT STEPS
  • Review the calculation of equivalent resistance in complex circuits
  • Learn about Kirchhoff's laws for circuit analysis
  • Explore practical applications of Ohm's Law in real-world circuits
  • Study the impact of resistor tolerance on circuit performance
USEFUL FOR

Students studying electrical engineering, hobbyists building circuits, and anyone seeking to improve their understanding of circuit analysis and current calculations.

qwerty2x
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Homework Statement



http://img25.imageshack.us/img25/5953/elek.png


Homework Equations



v=IR

The Attempt at a Solution


I have tried finding the total resistance of the circuit and then applying ohms law. My answer is 0.65 Amps but that's incorrect.

Any help is much appreciated!
 
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qwerty2x said:
I have tried finding the total resistance of the circuit and then applying ohms law. My answer is 0.65 Amps but that's incorrect.

Hi qwerty2x! :wink:

Show us your full calculations, and then we can see what went wrong, and we'll know how to help! :smile:
 
Use the equivalent resistance formulas and then Ohm's Law

For two resistors in series R_{eq} = R_{1} + R_{2}
For two resistors in parallel \frac{1}{R_{eq}} = \frac{1}{R_{1}} + \frac{1}{R_{2}}

or two resistors in parallel simplified R_{eq} = \frac{R_{1}R_{2}}{R_{1}+R_{2}}}

Hope this helps!
 

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