Physics 9702 · AS & A Level · Practical circuits

Practical circuits — practice question

Three identical lamps $L_1$, $L_2$ and $L_3$ are connected to a battery with negligible internal resistance, as shown in the diagram. What change occurs in the brightness of lamps $L_1$ and $L_2$ when switch $S$ is closed?

  • Alamp $L_1$: brighter, lamp $L_2$: brighter
  • Blamp $L_1$: brighter, lamp $L_2$: dimmer
  • Clamp $L_1$: dimmer, lamp $L_2$: brighter
  • Dlamp $L_1$: dimmer, lamp $L_2$: dimmer

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