Question

Two resistors of values 5 ohm and 10 ohm are connected in parallel calculate the effective resistance of the combination.

Answer 1

1/R=1/R1+1/R2
1/R=1/5+1/10
1/R=2+1/10
1/R=3/10
R=10/3
R=3.33ohm

Answer 2

Answer is

Effective resistance when connected in parellel

1/r=1/r1+1/r2

1/5+1/10=3/10

Therefore r =10/3