Diodes are electronic components that pass current in only one direction. The direction in which current can flow through the diode is called 'forward,' and the direction in which current cannot flow through the diode is called 'reverse.'
If you compare a diode to a human body, it is similar to blood vessels' valves. The valve prevents blood from flowing backward. Similarly, diodes also prevent current from flowing in unwanted directions.
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[…] Aquí tienes una simulación del funcionamiento de un diodo, en el que puedes cambiar la dirección de la corriente para conseguir una polarización directa […]