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Railways PYQCBT 1 2016

RRB NTPC · Question 21

Keeping voltage constant, if more lamps are put into a series circuit, the overall current in the circuit: A. Increases B. Decreases C. Remains the same D. Becomes infinite

  1. C

  2. B

  3. A

  4. D

Show answer & explanation

Answer: (B) B

Explanation

In a series circuit resistances add up. More lamps mean more total resistance, so at constant voltage the current (I = V/R) decreases.