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Diodes
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| a) |
Diode with d.c. supply. |
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Try reversing the battery
connections. This show that a diode is a component which
only conducts one way. |
| b) |
Diode with a.c. supply. |
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Note what
happens when you put a short circuit round the diode (that
is; when you connect B directly to C).
Connect the "earth" or "ground" connection of an
oscilloscope to A. Connect the 'scope input first to B
then to C. (This will allow you to compare the voltage
produced by the supply with the voltage across the bulb.) |
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c) |
Some special diodes |
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A light emitting diode
must always have a resistor in series with it. |
Try the zener diode circuit first
with one battery, then with two batteries in series,
then three …
This should show you why a zener diode is called
a voltage regulator diode |
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