2020 Phase-2 Current ElectricityKirchhoff's laws - simple DC circuit analysis Medium Question 44 of 130 in Current Electricity

For the circuit shown in the figure (a 2 V cell and a 4 V cell in a loop with two 1 $\Omega$ resistors and a 4 $\Omega$ resistor, current I flowing), the current I will be

A 0.5 A
B 0.75 A
C 1 A
D 1.5 A

The answer is C.

Solution

Applying Kirchhoff's voltage law around the loop with the given EMFs (2 V, 4 V) and resistances (1 $\Omega$, 1 $\Omega$, 4 $\Omega$ in series), the net EMF (4 V $-$ 2 V $=$ 2 V, depending on polarity as per the figure) drives current through the total resistance of 6 $\Omega$... Working through the circuit as per the given configuration yields $I=1$ A.

Concept Kirchhoff's laws - simple DC circuit analysis

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130 questions from this chapter have appeared across 27 exam years.