All labs

Electronics bench

Build real circuits from a supply, a resistor and an LED — then measure them, break them, and fix them. Ends where a microcontroller begins.

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Start: Close the circuit
Before you build a circuitOptional warm-upVoltage, current, resistance, and why an LED always needs a resistor. Ten minutes.

  1. Close the circuit

    Up next

    Why nothing happens until the loop is complete

  2. Which way round

    An LED only works one way, and nothing warns you

  3. Pick the resistor

    Enough to be bright, little enough to survive

  4. Ohm's law

    The one equation, now that you have felt it

  5. Two at once

    Side by side, not end to end

  6. Why isn't it working

    Nothing is unplugged. It still does not light.

  7. A switch is a gap

    Controlled on purpose, this time

  8. A pin is a switch

    The one the program presses