Electronics: Voltage and Electromagnetic interference

Voltage

• Electric charge is a physical property of matter that causes it to experience a force when placed in an electromagnetic field.
• An electromagnetic field is a region of space in which an electric charge experiences a force.
• Electric potential is defined as the amount of work/energy needed per unit of electric charge to move the charge from a reference point to a specific point in an electromagnetic field.
• Voltage is the difference in electric potential between two points.

Electromagnetic interference and noise

• Electromagnetic radiation is always present in a production enviroment. It could be mobile networks, solar flares, stroms lightning, ignition systems, etc.
• The interaction of electromagnetic radiation with an electrical conductor (such as copper wire) can cause voltage spikes in the conductor. This is called electromagnetic interference.
• The noise in an audio signal is the undesired voltage variations in the audio signal that causes artifacts and a loss of signal quality.