Help!

[t[-_-]t]

how does a LED work in a circuit?

[Stick]

A diode in general can stop current from 'flowing the wrong way' (basically if it is placed in a circuit in reverse no current will flow). However, diodes only allow electricity to flow in the forward direction once a certain voltage has been achieved, lowering the potential difference across the other circuit elements. Thus, one of its main applications is the prevention of over-heating and short circuits (amongst others).

An LED is simply a light-emitting diode. The main benefit of a LED compared to a normal lightbulb is its negligible resistance, making it much more efficient to run.

I hope I'm doing this right. Due to a poor Physics teacher, I'm basically teaching myself the course. I apologise if this is wrong.

[Shashim]

Okay just to add LED is an output transducer which means it transforms electrical energy to light energy.
You don't need to know how it does that, just the fact that it does this.
It is also non-ohmic  meaning it does not follwo ohms law V=IR.                         





















 

[yawho]

The voltage across a LED is 1.5 volts when it is in conduction mode with a current of 60 mA. What is the resistance of the LED?