Question

Three resisters 10 ohm,20 ohm,30 ohm are connect
A)series connection
B)parallel connection
Find the result resister in the circuit

Answer 1

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Let three resistors be R1 , R2 and R3 respectively.

a) When connected in series, Net resistance is given by $\bf{R=R1+R2+R3}$

So, R = 10 + 20 + 30 = 60 Ohms.


b) Now, when these resistors are connected in parallel combination.
Net resistance is given by $\bf{1/R=1/R1+1/R2+1/R3}$

So, 1/R = 1/10 + 1/20 + 1/30 = 11/60

or R = 60/11 Ohm


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