Question

Three residtances 20 ohm 30ohm and 60 ohm are connected in parallel their combined resistance is give by

Answer 1

As all three resistors are connected in parallel,

1/Rp = 1/R1 + 1/R2 + 1/R3

       = 1/20 + 1/30 + 1/60

       = 3+2+1/60 = 6/60 = 1/10

Rp is thus 10 ohms.

Hope it helps!