R1 = 20 || 30 = 12 ohm
R1 and 24 are in series
R2 = R1 + 24 = 36 ohm
R2 and 12 ohm are in parallel
R3 = R2 || 12 = 9 ohm
R3 and 18 ohm are in series
R4 = R3 + 18 = 27 ohm
R4 and 20 ohm are in parallel
R5 = R4 || 20 = 11.49 ohm
R5 and 12 ohm are in parallel
R6 = R5 || 12 = 5.87 ohm
R6 and 8 ohm are in series
RT = R6 + 8 = 13.87 ohm
Just keep combining parallel and series components (one pair at a time) working from the right most side toward the input. Eventually you will have a single resistance. To start, put the 20 and 30 ohm resistors in parallel. Then put that in series with the 24 ohm resistor. This combination can now be put is parallel with the 12 ohm resistor. Then keep going.
first start from the end 20 ohm and 30 ohm are in parallel. so their resistance becomes 12 ohm.
then 12 ohm and 24 ohm are in series. so they become 36 ohm.
then 36 ohm and 12 ohm in parallel. they become 9 ohm.
9 an 18 in series. they become 27 ohm.
now 27 ohm and 20 in parallel. after that solve yourself.
RT= 1/ 1/r1+1/r2+1/r3
RT= R(if all are equal resistors then just use the value of one resistor)/ number of resistors
^^^^^parallel only
then in series parts theyre additive
Complete question is here.......
Find the equivalent resistance RT of given circuit. Write each step of the calculation to get maximum marks. Draw the circuit diagram of each step
plz find the circuit diagram by clicking on the link given below.
http://i1161.photobucket.com/albums/q504/jalpari258/untitled.jpg
copy and paste this in your browser. and solved this question plzzzzzz.