Question

How will you connect three resistors of 2 ohm, 3 ohm, and 5 ohm respectively so as to obtain a resultant resistance of 2.5 ohm? Draw circuit diagram.

Answer 1

The 2 ohm and 3 ohm resistors will be connected in series. This will give a resultant resistance of 5 ohm.
Then this arrangement will be connected with the 5 ohm resistor in parallel. This will give a effective resistance of 2.5 ohm.

Answer 2

Answer: $2 \Omega$ and $3\Omega$ in series and $5\Omega$ in parallel

Explanation:

Given $2\Omega$ and $3\Omega$ in series.

So, R=$(2+3)\Omega=5\Omega$

Given, that R is in parallel with $5\Omega$

Therefore, for $R_{resultant}$

$\frac{1}{R_{resultant}}=\frac{1}{R}+\frac{1}5}$

which gives $R_{resultant}= 2.5\Omega$

The circuit diagram is:

#SPJ2