Electronics refers to the flow of charge (electron) through non-metal conductors (often called semi-conductors), where as electrical refers to the flow of charge through metal conductors. For example, flow of charge through silicon which is not a metal would come under electronics whereas flow of charge through copper which is a metal would come under electrical. This distinction started around 1908 with the invention by Lee De Forest of the valve (triode). Until 1950 this field was called "Radio technics" because its principal application was the design and theory of radio transmitters and receivers.
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