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Calcul rezistenta echivalenta


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salut!am urmatoarea nelamurire,intr-o problema se dau doi rezistori cu valoarea:R si 2R,unde trebuiesc legati in paralel(1) 1/Rp=1/R1+1/R2 in cazul meu: 1/Rp=1/R+1/2R=3/2R(2) Rp=R1*R2/R1+R2 in cazul meu: Rp=R*2R/R+2R=2R/3Racum,nelamurirea mea este ca,folosind formulele de gruparea rezistorilor in paralel,am obtinut doua rezultate diferite.daca am utilizat prima formula (1) rezultatul a fost 3/2R trebuind (si aici am vazut si la alte probleme) sa-l notez ''invers'' adica 2R/3(lucru care era corect in rezolvarea data)deci,de ce se omite ''R''de la numitorul fractiei formulei (2)si de ce trebuie (trebuia)scris invers rezultatul primei formule ca sa fie corect ???multumesc !va multumesc!!

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