Answer:

1.An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit

2.Schematic diagrams are used by electrical engineers to describe the electron source, electron path, and components of a circuit. Switches can be closed or open, push button, rotary, or switched.

3.Polarity is a property of covalent compounds which is a consequence of differences in electronegativity of the bonded elements.

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