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If I have two brances, branch 1 and branch 2 which are in parallel and each branch has a resistance and inductance, to calculate the equivalent series resistance and inductance, can I calculate the resistance and inductance separately e.g.

R_{eq}= R_{1}*R_{2}/R_{1}+R_{2}(and same for X),

or do I have to do it combined E.g.

Z_{eq}= (R_{1}+jX_{1})*(R_{2}+jX_{2})/(R_{1}+jX_{1})+(R_{2}+jX_{2}), and then convert to polar etc and back to rectangular to find the equivalent R and jX values? The two methods give me different answers?

Sorry, forgot to add, the values of R and X are in PER UNIT

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# Parallel Impedance to Series?

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