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Physics · Oct / Nov 2017 · Paper 11 · Question 36

5054Circuit diagrams and circuit components

A light-emitting diode (LED) is connected to an alternating current (a.c.) supply. The LED flashes on and off. What is the direction of the current in the LED when it emits light?

  1. Atowards the left only
  2. Btowards the right only
  3. Ctowards the left or towards the right
  4. Dthere is no current in the LED

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Correct answer: B. towards the right only

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