10TH GRADE · ELECTROSTATICS
Capacitors
Electrical capacity, flat capacitor, energy and connections.
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
Capacitor
A system of conductors designed to store electrical charge and field energy.
Equal opposite charges accumulate on its plates, and energy is stored in the electric field between them.
Series connection of capacitors
A connection in which adjacent plates form intermediate nodes without external branches.
All capacitors have the same charge, the voltages add up, and the equivalent capacitance is less than any individual capacitance.
Parallel connection of capacitors
A connection in which plates of the same name are connected to common nodes.
The voltage on all branches is the same, the charges add up, so the equivalent capacitance is equal to the sum of the capacitances.
Physical quantities
Electrical capacity
The ability of a conductor or capacitor to store charge at a given voltage.
Unit: farad ·
Cover area
The area of the overlapping part of the capacitor plates.
Unit: square meter ·
Capacitor energy
Electric field energy of a charged capacitor.
Unit: joule ·
Lesson formulas
Determination of electrical capacity
Electrical capacity is equal to the charge per unit voltage.
Definition of farad
One farad corresponds to a charge of one coulomb at a voltage of one volt.
Capacitance of a parallel plate capacitor
The capacity increases with area and permeability and decreases with the distance between the plates.
Capacitor energy
The energy of a charged capacitor is expressed in terms of capacitance, voltage or charge.
Charges and voltages in series connection
Capacitors connected in series have equal charges, and the voltages add up.
Series capacitance
The reciprocal of the total capacity is equal to the sum of the reciprocal capacities.
Parallel connection of capacitors
When connected in parallel, the capacitances and charges add up, the voltage is the same.
Related formulas
The same formulas in the reference, with symbols and units.
Tasks on the topic
Statements, answer options and the walkthrough.