Question

For the given circuit diagram; the equivalent resistance across battery is :

• A. $5\Omega$
• B. $10\Omega$
• C. $20\Omega$
• D. $15\Omega$

Answer 1

The correct option is D $15\Omega$

Resistance $8\Omega$ and $0.5\Omega$ are in series and Resistance $7\Omega ,1\Omega$ and $10\Omega$ are also in series.
now $(7+1+10=18)$ are in parallel with $6\Omega$ resistor.
so their equivalent is$4.5\Omega$

Equivalent resistance across battery is

$R_{eq}=8.5+2+4.5$

$=15\Omega$