Question

Three resistors are connected as shown in the following figure. Through the resistor 5 ohm a current of 1 A is flowing.
(a) What is the total resistance?
(b) What is the potential difference across AB and BC?
(c) What is the current through other two resistors?

Answer 1

V= I R =  1 x 5 = 5 volt 

a) 

 1 /Req = 1 / 10 + 1 /15 

1/ req = 5 /  30 

Req = 6 

Now I = 5 / 6 

I = 0.8 A 

b ) potential difference across A and B 

dv= (5 -0 ) 

dv = 5 volt 

potential difference across A and C 

dv =  { 5 + ( 0.8 x 6 ) - 0  }

dv = 9.8 volt 

r total = 5 + 6 = 11 Ω