Question

(c) Calculate the equivalent resistance between P and Q from the following diagram






​

Answer 1

The two 10Ω resistors are in series and they are parallel to the 5Ω resistor.

The equivalent resistance  

R

1

​  

=  

20

1

​  

+  

5

1

​  

=  

25

5

​  

=  

4

1

​  

 

⟹R=4Ω

Therefore, Resistance between PQ=R  

PQ

​  

=3+4+2=9Ω..