Question

Calculate the electric current flowing through the $20.5\Omega$ resistor in the following circuit.

• A. $1.366A$
• B. $0.366A$
• C. $2.366A$
• D. $3.366A$

Answer 1

The correct option is B $0.366A$

Given:
Source voltage, $V=7.98V$
Resistor 1, $R_1=20.5\Omega$
Resistor 2, $R_2=1.3\Omega$
Effective resistance in series, $R_{eff}=R_1+R_2$
$R_{eff}=20.5+1.3=21.8\Omega$
In series combination, the same current flows through all the resistors. So, the current through the resistor $R_1$ is the same as the total current in the circuit.
$\therefore$Current, $I=\frac{V}{R_{eff}}=\frac{7.98}{21.8}=0.36605A.$