Question

Resistors of 2Ω, 3Ω and 5Ω are connected in parallel with a 10 V battery, the total power consumed by the combination is

 (a) 3000/31 W  (b) 310/3  W  (c) 30 W  (d) 310 W​

Answer 1

Here is the answer. Hope it helps

Answer 2

Let R be total resistance of combination
As resistances are in parallel
=> 1/R=1/2+1/3+1/5
=> 1/R=31/30
=> R=30/31

We know,
P=V^2/R
=> P=10^2/(30/31)
=> P=100/(30/31)
=> P=100*31/30
=> P=310/3