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electric charge

positive charge:
- protons (atomic nucleus)
- (kat-) ions (ionized metal, ionized hydrogen, ionized gases... )

negative charge:
- electrons (atomic envelope)
- (an-) ions (remaining acid ions, ...)

force of repulsion between like charges
force of attraction between different charges

elementary charge, charge of an electron

Electricity

Electric charge: a property of some subatomic particles, which determines their electromagnetic interactions. Electrically charged matter is influenced by, and produces, electromagnetic fields.
Electric current: a movement or flow of electrically charged particles, typically measured in amperes.
Electric field: an influence produced by an electric charge on other charges in its vicinity.
Electric potential: the capacity of an electric field to do work on an electric charge, typically measured in volts.
Electromagnetism: a fundamental interaction between the magnetic field and the presence and motion of an electric charge.

galvanic separation



example: Pyro- und Piezoeffekt bei Turmalinkristallen