Lesson 12 of 15
Checkpoint: LEDs, kinds of current and faults
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An LED stays dark. The battery is good and the loop is closed. What may be wrong?
Which lamp glows whichever way round it is joined?
Which kind of current flows in one direction only?
Which gives alternating current?
The switch is closed. The cell is new. The wires are fine. The lamp is dark. What is likely?
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