Question

Three resistance r1,r2 and r3 are connected in parallel. Find their equivalent resistance

Answer 1

r1 r2 and r3 are in parallel connection
Therefore the equivalent resistance (req) can be calculated by:

1/req= 1/r1+1/r2+1/r3
1/req= (r2r3+r1r3+r1r2)/r1r2r3

req= r1r2r3/r2r3+r1r3 +r1r2