Elenco Electronic Playground 50-in-1 Experiments - Manual (Page 24)

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Connect the wires according to the Wiring Checklist and
press the switch, the LED lights up. The diode’s turn-on
voltage of 0.7V is easily exceeded and the diode has little
effect on the circuit. Now reverse the wires to the diode
and try again, nothing happens. The diode is now
reverse-biased and blocks current flow through the
circuit, just like the plate and solid stop block the water
flow in the drawing shown above. You’ve probably noticed a similarity between the
schematic symbols for the diode and the LED. Re-wire
the diode back to forward-biased or remove it from the
circuit and then reverse the wires to the LED. Press the
switch and LED doesn’t light, do you know why?
Starting now, the equivalent water diagrams will no
longer be presented.
EXPERIMENT #11: One-way Current
Wiring Checklist:
o 27-to-56
o 55-to-43
o 42-to-10
o 11-to-3
o 4-to-26
Schematic