Point 1 of 6 — Lesson 2: Digital Electronics and Logic Gates (NOT, AND, OR)Question bank: 105 questions (105 with pictures)
01Analog and digital signals
All electronic systems deal with natural quantities (sound, light, temperature) by converting them to electrical signals; for example, the microphone converts sound to a voltage, the video camera converts an image to electric signals.
In TV, picture and sound are converted to electrical signals, then to electromagnetic waves at the transmitter, and back to electrical signals at the receiver.
Electronics in which the signal can take any value in a continuous range, imitating the natural quantity, is called analog electronics.
Indigital electronicsthe signal has onlytwo possible valuesrepresenting two states, 0 and 1(low and high voltage).
Any number, letter or symbol is encoded as a string of 0's and 1's (the binary system).
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105 questions linked to this point only, 105 of them with pictures.
