Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles.   Electronic Signals     How information is encoded using an electric current: The voltage of the current is changed rapidly and repeatedly to encode a message, called an electronic signal. There are two different types of electronic signals: digital signals and analog signals.     - A digital signal consists of pulses of voltage in a circuit, created by repeatedly switching the... Show more

Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles.
 

Electronic Signals    
How information is encoded using an electric current: The voltage of the current is changed rapidly and repeatedly to encode a message, called an electronic signal. There are two different types of electronic signals: digital signals and analog signals.    
- A digital signal consists of pulses of voltage in a circuit, created by repeatedly switching the current off and on. This type of signal encodes information as a string of 0's (current off) and 1's (current on). This is called a binary (“two-digit”) code. DVDs, for example, encode sounds and pictures as digital signals.    
- An analog signal consists of continuously changing voltage in a circuit. For example, microphones encode sounds as analog signals.    

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