Diagrams B represents a complete series circuit. The two bulbs are connected with a series with a battery.
What is series circuit?
In the series circuit, the amount of current flowing through any component in a series circuit is the same and the sum of the individual resistances equals the overall resistance of any series circuit.
The voltage in a series circuit, the supply voltage, is equal to the total of the individual voltage drops. The two bulbs are connected with a series with a battery.
Hence, diagrams B represents a complete series circuit.
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