Question

In the given network, the current flowing through $15\Omega$ resistance is

• A. $0.8A$
• B. $1.0A$
• C. $1.2A$
• D. $1.4A$

Answer 1

The correct option is C $1.2A$

The given network is a Wheatstone bridge

Equivalent resistance=$(15+3)\parallel (20+4)\Omega$

$=18\parallel 24\Omega$
$=10.28\Omega$

$\therefore$Voltage across the whole circuit=$10.28\times 21$

$=21.59\Omega$

$\therefore$ Current through $15\Omega =\frac{21.59}{15+3}$

$\frac{21.59}{18}$

$=1.199$