Electrical appliances work due to electrical currents that are ordered flows of electrons. However, the charges of the currents are not consumed in the device, i.e., electrons do not disappear...

An electric current, when going through a circuit, can produce several effects: heat a conductor, generate chemical reactions in electrolytic conductors, move the needle of a compass near a...

In an electric circuit, the component which the main purpose is to make it difficult the flow of electrical currents is called electrical resistance or resistor.

Resistors can be associated in several ways: parallel, in series or in a mixed combination of parallel and series associations.

Electric generators are devices that transform other forms of energy into electrical energy.

A device that can transform electrical energy into another form is called receiver. Examples of receivers are: iron, fan, electric motor, refrigerator, computer, etc.

For circuits maintenance and building, measuring equipments are indispensable. The most important devices are the ones that make measurements of current, voltage and electrical resistance.

Every route established for movement of electric charges is called electric circuit. For a current to be able to circulate, a closed circuit is required to ensure that electrons can move around.