The current in the second circuit in series with the first circuit is 0.4 A.
Current in series circuit
The current flowing in series circuit is the same across all the component of the circuit.
The total voltage drop in a series circuit is given as;
V = IR₁ + IR₂ + IR₃
V = I(R₁ + R₂ + R₃)
If the current in first circuit is 0.4 A, when second identical bulb is added in series, the current in the second circuit will be 0.4 A.
Thus, the current in the second circuit in series with the first circuit is 0.4 A.
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