Question

calcule a resistência equivalente dos resistores sendo: R1=R2=R3= 9 ohms que estão em paralelo: A)2ohms, B) 3 ohms, c) 1 ohms, d) 0 ohms.​

Answer 1

$\boxed{\boxed{b) \ 3 \ ohms}}\\\\\\\dfrac{1}{R_{eq}} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + \ ... \ + \dfrac{1}{R_n}\\\\\\\dfrac{1}{R_{eq}} = \dfrac{1}{9} + \dfrac 19 + \dfrac19\\\dfrac{1}{R_{eq}} = \dfrac39\\R_{eq} = \dfrac 93\\R_{eq} = 3,0\Omega$