Question

1.21. Three resistances of 10 ohms, 15 ohms
and 30 ohms are connected in parallel.
The total resistance of the combination
is
(a) 5 ohms
(6) 10 ohms
(c) 15 ohms (d) 55 ohms
onion​

Answer 1

Hey Mate........

Use the formula.........

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

Answer 2

Explanation:

1/R = 1/R1+1/R2+1/R3

1/R = 1/10+1/15+1/30

1/R = 3+2+1/30. ( LCM = 30 )

1/R = 6/30 = 1/5

R = 5 ohms