A Logic Gate is normally an electronic circuit that performs a logical operation on an input signal. A Logic Gate may also be mechanical, optical, or electro-mechanical in nature. All microprocessors make use of Logic Gates in numerous combinations.
These tutorials was visually designed to simply teaching about Logic Gates. They use momentary switches to represent the inputs and a light bulb to represent the output. All inputs and output are shown with a Truth Table.
The AND Gate
This gate has two inputs, demonstrated by two push buttons in series.
The NOT Gate
This gate has only one input and one output. It is also know as an Inverter because it inverts the input. So if it has an input of TRUE then the output would be FALSE.
This presentation uses a push button to represent the input, a relay to perform the inversion.