A circuit is composed of electrical loops which may include circuit elements such as wires, batteries, resistors, lightbulbs, capacitors, switches, ammeters, voltmeters, etc.
An electrical loop is a closed path through which charges may flow.
A closed circuit is one in which charges would be able to flow.
An open circuit is one in which charges would not be able to flow.
A single circuit element may be part of multiple electrical loops.
Circuit schematics are representations used to describe and analyze electric circuits.
The properties of an electric circuit are dependent on the physical arrangement of the elements.
Circuit elements have common symbols that are used to create schematic diagrams. Variable elements are indicated with a diagonal strikethrough arrow.
Electric circuits are considered to be made up of localized circuit elements connected by wires which have essentially negligible resistance. The three basic circuit elements are resistors, capacitors, and inductors. Only these passive elements will be considered here; active circuit elements are the subject of electronics.