Question

Find the power dissipated in the 27 ohm resistor, if
the potential difference across 4ohm resistor is
20 V.
(1) 59 W
(2) 96 W
(3) 108 W
(4) 121 W​

Answer 1

V = I.R

given, V = 20 V ,

R = 4 ohm

I = 20/4 = 5 A.......(1)

now,

power = I².R

putting the value of I from eqn .....(1)

P = 5×5×27 = 675 watt.