Passion of IT

Resistor, Diodes

After discovering that the energy is due to the movement of the electrons the question is: “How can I use this energy?”

there are a lot of electronic components.

The first one is a resistor:

resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits. [Wikipedia]

Resistor has two tasks:

  • keeps the current in the defined range (minimum, maximum) . This is very useful to avoid that strong currents damages delicates electronic components
  • Converts the current into heat. It is useful for building ovens

The second Electronic component is a Diode

Diode is a two-terminal electronic component with asymmetric conductance; it has low (ideally zero) resistance to current in one direction, and high (ideally infinite) resistance in the other.

The most commonly function of a diode is to allow an electric current to pass in one direction (called the diode’s forward direction), while blocking current in the opposite direction (the reverse direction).  [Wikipedia]

The diode is made of a simple PN junction:

when you make in contact two conductors: one doped with electrons and the other one doped with protons(holes) you create a PN Junction.

In this junction is allowed the current in only one direction: from  the P-conductor to the N-conductor because of the barrier.

The diode has many purposes:

  • Protecting an electronic reverse priority
  • LED (Light emitting diode) that emits light when it is activated


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