Understanding Rms Current: Definition, Calculation, and Resolved Issues

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Find the inductive reactance XL.
Total impedance Z = Sqrt(R^2 + XL^2)
I = V/Z
 
rl.bhat said:
Find the inductive reactance XL.
Total impedance Z = Sqrt(R^2 + XL^2)
I = V/Z

why should i use this formula instead of the above??
 

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