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Electricity: Circuits and their Components

Checkpoint: LEDs, kinds of current and faults

Five ideas from the last three lessons. Answer, read the note, and try again.

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?

0 of 5 answered

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This track

  1. 0 Start here
  2. 1 The loop has to be unbroken
  3. 2 A switch is a gap you can close
  4. 3 Some things let the loop through
  5. 4 A drawing everyone reads the same way
  6. 5 Two or more cells make a battery
  7. 6 One loop, one break, everything stops
  8. 7 Cells are for experiments
  9. 8 Checkpoint: loops, switches, parts and safety
  10. 9 An LED has a right way round
  11. 10 Two kinds of electricity
  12. 11 Why a lamp may stay dark
  13. 12 Checkpoint: LEDs, kinds of current and faults
  14. 13 The big picture
  15. 14 Track quiz

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