What is a transistor

The transistor is the fundamental building block of modern electronic devices, it is a semiconductor device used to amplify and switch electronic signals.

More simply a transistor is a valve for electricity. In this video I demonstrate the two types of transistors (NPN and PNP) and explain their uses.

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What is a Photo Resistor

Photocells, (LDR) Light Dependent Resistor, Photo Resistor, Cadium Sulfide Cell (CdS), all of these names refer to the same thing. Photo Cells are semiconductors that are also resistors that change their resistance depending on the amount of light.

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What is a LED

An LED or Light Emitting Diode is a low power semiconductor light source used in lots of electronic devices. LEDs are closeley related to transistors and regular diodes.

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