7. ELECTRIC CIRCUITS AND ELECTRONICS

1. AN ELECTRIC CIRCUIT.

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

1.1. Parts of an electric circuit.
Electric circuits consist of various parts:

• Generators provide the energy that electrons need in order to move.

 

• Loads are devices that transform electric energy into other types of energy that we can use.

   Light bulbs
  Motors

Resistors
 Bells

• Switching devices are used to direct and interrupt the flow of electric current.

  Switches
Push buttons
3-Way switches


1.2. Diagrams and symbols.
Generators: electrochemical cell and battery.
Loads: Light bulb or lamp, resistor, motor, bell, relay.
Switching devices: switch, push button, 3-way switch.
Safety elements: fuse.
Measuring instruments: ammeter, voltmeter.
Other parts: connection and bridge.