KEAM 2019 Physics and Chemistry Paper

The circuit can be redrawn as shown in the figure below,So, the equivalent resistance of the three parallel branches is given as.
Req=‌

1

1 0.5+0.5 +‌ 1 1 +‌ 1 1

=‌

1

3

Ω
Now, from Ohm's law
I=‌

V

R

=‌

27

1/3

=27×3=18A
Here in the figure, 3 branches are of equal resistance, so current will divide equally in each branch, So, current in R3,
IR3=‌

27×3

3

=‌

81

3

=27A