O-LevelPhysicsElectricity5054/11 · Oct/Nov 2017 · Q361 Mark

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?

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Atowards the left only

Btowards the right only

Ctowards the left or towards the right

Dthere is no current in the LED

✓ Correct answer

B: towards the right only

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2017 Paper 1 Variant 1, question 36.

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