modified 2 years ago

Voltage and LED2

00:57:42

Why the need to limit current 

published 2 years ago

Johnsonutpb

2 years ago

MattFerrie

2 years ago

You need a current limiting resistor in series with an LED at least whenever the supply voltage is higher than 2 volts, because the forward voltage drop of the LED is around 0.7 volts, after which the conductance increases rapidly, so that at a supply voltage of 2 volts the current is around 20 milliamps. If the supply voltage goes any higher than that, current will increase exponentially and blow up the diode.

Johnsonutpb

2 years ago

That is correct; and is the exact point (with ohms law) that I have created this circuit to illustrate...

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