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
