Verifying Circuit Calculations: Is It Correct?

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SUMMARY

The forum discussion focuses on verifying circuit calculations related to total resistance, current, voltage, and power. The calculations presented include a total resistance of 6.25Ω, resulting in a total current of 4A and a voltage of 20V. However, the user incorrectly calculated the current through a 10Ω resistor in a parallel circuit, failing to account for the current divider rule. The correct voltage across the terminals (Vab) is 24V, leading to a revised current calculation of 24V/15Ω for accurate power determination.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Knowledge of series and parallel circuit configurations
  • Familiarity with current divider rule
  • Ability to calculate power using the formula P=VI
NEXT STEPS
  • Study the current divider rule in parallel circuits
  • Learn how to calculate voltage across terminals in complex circuits
  • Practice circuit analysis using simulation tools like LTspice
  • Review power calculations in electrical circuits, focusing on P=I²R
USEFUL FOR

Electrical engineering students, circuit designers, and hobbyists interested in verifying and understanding circuit calculations and principles.

jayjay112
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Please see circut and question at http://www.flickr.com/photos/37144556@N07/3421275866/sizes/o/

Are these calculations correct?


(a)total resistance= 6.25
25/6.25= I total = 4
v=ir 4x6=20v


(b)v=ir so 20/10= 2amps
power=vi so 2x25=50watts?


Thanks
 
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jayjay112 said:
Please see circut and question at http://www.flickr.com/photos/37144556@N07/3421275866/sizes/o/

Are these calculations correct?

(a)total resistance= 6.25
25/6.25= I total = 4
v=ir 4x6=20v

(b)v=ir so 20/10= 2amps
power=vi so 2x25=50watts?

Thanks

Your total I is correct. But the Vab is found either by 4*Req = 4*6 = 24 or by noting that 4*1/4 is 1v and across the terminal Vab = 25 - 1 = 24. Either way works.

In b) unfortunately you have not grasped that you have a current divider with the || network and that the current through each leg is determined by Vab which is 24, divided by the resistance through that leg. You have 15Ω through the leg with the 10Ω resistor. Hence the current through the resistor is going to be 24/15.

Once you have the current through the leg, then you can use your I2R to determine power.
 
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