Physics 9702 · AS & A Level · Practical circuits

Practical circuits — practice question

Three identical filament lamps, P, Q and R, are connected to a battery with negligible internal resistance, as shown. The filament in lamp Q breaks, so that it no longer carries current. What changes occur in the brightness of lamps P and R?

  • Alamp P brighter, lamp R brighter
  • Blamp P brighter, lamp R dimmer
  • Clamp P dimmer, lamp R brighter
  • Dlamp P dimmer, lamp R dimmer

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