Physics 5054 · O Level · Action and use of circuit components

Action and use of circuit components — practice question

A light-emitting diode (LED) is linked to an alternating current (a.c.) supply. The LED switches on and off repeatedly. In which direction is the current in the LED when it is producing light?

  • Atowards the left only
  • Btowards the right only
  • Ctowards the left or towards the right
  • Dthere is no current in the LED

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