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Doodle Science teaches you high school physics in a less boring way in almost no time!
Script:
Diodes are electronic components, which can be used to regulate the potential difference in circuits and to make logic gates.
Diodes have a very high resistance in one direction, (ideally infinite) and a very low resistance in the other direction (ideally zero). If you were to measure the voltage across a diode and the current passing through it and plot it on a graph it would look something like this. As you can see, when you flip the diode the other way, there is a very high resistance.
A light-emitting diode, LED, produces light when a current flows through it in the forward direction. Because they use so little energy and last a substantial time longer than conventional filament bulbs, they are becoming more popular.
Thermistors are used as temperature sensors, for example in fire alarms. They are made from semiconducting materials that lower resistance as they increase in temperature. So when things get hot, the current passes through them and the alarm is triggered. Besides they're cool because the symbol looks like it's playing hockey (joke courtesy of Samuel Ashcroft).
Light dependant resistors or LDRs are used to detect light levels. Their resistance decreases as the light intensity increases. So when it's bright, the current flows through it more easily. But the symbol isn't nearly as interesting.
