ELECTRONIC COMPONENTS.
We will analyse the most usual electronic components.
Fixed resistance or resistor.
It opposes the low of an electric current and its value is indicated by a code of colours and numbers, and we measure it in ohms.
The code of colours and numbers is form by four stripes. The first two sripes are replaced by their number according to their color. The third stripe is replaced by the number of zeros that we ave to add to the previous number, according its color. The last stripe means the tolerance or the máximum deviation from the complete value.
 |
| Potentiometer. |
Variable resistance or potentiometer.
Potentiometers can adjuste the value between zero and the máximum value specified by the manufacturer.
Resistance that depends on a physical factor.
There are two physical factors that can affect the resistance; temperature and the amount of light.
🔷Thermisors are the resistances that depends on the temperature. There are two types:
➖NTC (Negative temperature coefficient) : When the temperature rises, the resistance decreases.
➖PTC (Positive temperature coefficient) : When the temperature rises, the resistance increases.
🔷 LDR: These device are often used in security systems like sensors. The resistance varies according to the amount of light received. If the resistance decreases as the amount of light increases.
  |
| Thermistors. LDR |
CAPACITORS.
Capacitors are components that can store an electric charge and its value indicates the charge in volts hat it can store. This is measured in farads.
Is necesary have precaution with this type of component.
DIODES.
They are electronic components made of semiconductor materials and they can only allows eletric curent to flow in one direction. A diode is form by an anode and a cathode.
A LED only gives off light when an electric current flows through it.
No hay comentarios:
Publicar un comentario