Question

An electric circuit constitutes a battery of 10V, a 20 ohm resistor and a 30 ohm resistor all connected in series. Find power consumed by 30 ohm resistor

Answer 1

first find the current
I=V/R
 =10/20
 =.5A
now since in series current remains the same
P=VI
  =10(.5)
  =5W(wartz)