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A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω , 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
Given: A battery of 9 V is connected in series with resistors of $0.2\ \Omega$, $0.3\ \Omega$, $0.4\ \Omega$, $0.5\ \Omega$ and $12\ \Omega$, respectively.
To do:
To find the current flowing through the 12 \Omega resistor.
Solution:
Here given, voltage $V=9\ V$
As given the resistors are connected in series, $R$ will be the sum of resistances of all resistors.
$R=R_1+R_2+R_3+R_4+R_5$
Or $R=0.2\ \Omega+0.3\ \Omega+0.4\ \Omega+0.5\ \Omega+12\ \Omega$
Or $R=13.4\ \Omega$
As the resistors are connected in series, the current flowing through each component will be the same.
Let $I$ be the current flowing.
We know that $I=\frac{V}{R}$
Or $I=\frac{9\ V}{13.4\ \Omega}$
Or $I=0.671\ A$
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