Electronics Devices are those devices which are made from semiconductors like transistors fet mosfet amplifiers and ic's and other p-n junction devices.
while mechanical devices are those devices which follow the mechanical principle
such as strain gauge , machines and robot etc.
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An electrical or electronic engineer.
Opto-electronic is an abbreviation of "optical-electronic". It refers to a class of electronic devices that incorporate light emitters and/or detectors. Opto-electronic devices include emitters like LEDs and solid-state lasers and detectors like photodiodes.Products incorporating opto-electronic devices include:Remote controls.Digital cameras.Solar cells.Barcode scanners.
electronic and communication branch is the branch of engineering which deals with semiconductor component and devices . and communication means the data between two person interchange you can see mobile phone internet and T.V and satellite these are example of electronic communication.
cameras
There are many electronic devices in the world that do in fact give off radiation. These devices include computers and microwaves for example.