Hi. I am having problems finding the Req in parallel circuits. I have a problem like this R1- 12 R2- 8 R3- 8 emf- 12 Now I know Req= 1/R1, 1/R2, 1/R3 but my homework book explains that 1/12 1/8 1/8 = (2+3+3)/24 = 8/24 = 1/3 = Req is 3 coulomb I want to know where the 2+3+3 comes from, I have absolutely no idea how to find that. I also have another question that says r1-5 r2-10 r3-15 R1 1/5, R2 1/10, R3 1/15 1/5= .2 1/10= .1 1/15= .066 Req= 0.37 I know this isn't right . I have tried for awhile just by myself to figure this out (I am doing this as a home class) but I cannot do it. Someone please help me out!