8TH GRADE · CHARGE AND ELECTRIC FIELD
Atomic structure and charge conservation
Electron, ions, divisibility and the law of conservation of charge.
The entire theory of the lesson is collected here; you can read it without an account. In interactive mode, the same theory appears as cards, followed by questions. with checking the answer and task, and progress is saved.
Basic Concepts
Electrical structure of the atom
An atom consists of a positively charged nucleus and negative electrons, while a neutral atom has equal charges.
Losing electrons forms a positive ion, gaining extra electrons forms a negative ion.
Law of conservation of charge
The algebraic sum of the electric charges of a closed system remains constant.
During electrification, a charge is not created out of nothing: electrons move between bodies, maintaining a total charge.
Elementary charge
The electric charge of a body changes in portions that are multiples in absolute value of the charge of one electron.
Divisibility of charge does not mean the possibility of obtaining an arbitrary small fraction in ordinary school experiments.
Physical quantities
Elementary charge
Module of electric charge of electron and proton.
Unit: pendant ·
Tasks on the topic
Statements, answer options and the walkthrough.