Electric circuits and electronics

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Electric circuits and electronics

An electric circuit

An electric circuit is a pathway for the flow of electrons. Electric current is a continous flow of electrons through a circuit.

Diagrams and symboles

Parts of an electric circuit

Switching devices direct and interrupt the flow of energy current

3-way switches

Push buttons

Switches

Loads transform electrical energy in other types of energy

Bells

Resistors

Motors

Light bulbs

Generators provide the energy

Cells and batteries

Electrical quantities

Electrical resistance: Ohm's Law

Subtopic

Measuring electric current

Electric current (I) is the charge or number of electrons that flow through the cross-section of a conductor every second. We can express this mathematically as follows: I=Q/t. Electric current is measured in amperes or amps (A) in the International System.

The ammeter is used to measure electric current

Voltage or potential difference

The amount of energy that generator can transfer to electrons depends on its voltage (V) or electric tension. This is measured in volts (V).

We use a voltmeter to measure voltage