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December 25th, 2017, 08:10 AM  #1 
Member Joined: Oct 2015 From: Greece Posts: 81 Thanks: 6  Complex Numbers Calculation Help!!!
Can you tell me what I did wrong? I really can't find the mistake! Here is my problem Also if you can't see it Ohms * Amperts = Volts The result should be: 144,3kv * angle(4,93) Last edited by skipjack; December 26th, 2017 at 12:34 PM. 
December 25th, 2017, 11:04 AM  #2 
Senior Member Joined: Jul 2012 From: DFW Area Posts: 626 Thanks: 90 Math Focus: Electrical Engineering Applications 
Hi babaliaris, I think that your calculation for $\large \tan^{1} \left (\frac{20}{6} \right )$ is incorrect. Using the value that I calculated, I arrived at the given answer. 
December 25th, 2017, 11:52 AM  #3  
Member Joined: Oct 2015 From: Greece Posts: 81 Thanks: 6  Quote:
At least now I know that my logic is correct. One more question. Can I do this calculation faster? Our Professor said to us "When you want to add two Complex Numbers, you use the Cartesian form and when you want to multiply you use the polar form." So every time when I do a calculation I need to convert the numbers from Cartesian form to polar and the opposite depending on what I'm doing. Last edited by skipjack; December 26th, 2017 at 12:35 PM.  
December 25th, 2017, 12:42 PM  #4  
Senior Member Joined: Jul 2012 From: DFW Area Posts: 626 Thanks: 90 Math Focus: Electrical Engineering Applications  Quote:
Last edited by skipjack; December 26th, 2017 at 12:36 PM.  
December 25th, 2017, 01:03 PM  #5 
Member Joined: Oct 2015 From: Greece Posts: 81 Thanks: 6  Yeah, probably this is the only way, but anyway thank you for your help!!!
Last edited by skipjack; December 26th, 2017 at 12:36 PM. 
December 26th, 2017, 12:28 PM  #6  
Global Moderator Joined: May 2007 Posts: 6,613 Thanks: 617  Quote:
Last edited by skipjack; December 26th, 2017 at 12:38 PM.  

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