AC Circuits question verification

[Yarnzorrr]

Hi there,

in this youtube tutorial about AC circuits

http://www.youtube.com/watch?v=JiLdrAHBBRc&feature=plcp

at about 4:08 It's supposed to be z=√(R^2+(XL-Xc)^2)) but in the example she does Xc-XL, is there a reason for this or is it a mistake in her working??

 

[skeptic2]

Xl - Xc is correct. In her example she has (Xc - Xl)^2. When she squares the difference, the result is the same.

 

[Emilyjoint]

The equation should be written
Z = √(R^2 +(XL ~XC)^2)
because it is the difference between XL and XC that is important. It does not matter which is greater.

 

[skeptic2]

In this equation that's true but generally Xl is regarded as positive and Xc as negative.

 

[alphysicist]

Hello there,

Thank you for bringing this to my attention. After reviewing the video, I can confirm that the equation used is correct. The mistake in the working is most likely a simple error made by the presenter. It is important to always double-check equations and calculations in order to avoid these types of mistakes. Thank you for verifying the information and bringing it to my attention.