You use a diode in a circuit to make sure that if the power was reversed it would not destroy the components, it can also be used to emit light. Its main use is that it is that positive energy can only enter from one side.
no we not use resistance in place of diode.
Bipolar Transistors and Diode's .
Zener diodes are a form of semiconductor diode that are widely used in electronics circuits as voltage references. Zener diodes provide a stable and defined voltage and as a result Zener diode circuits are often used in power supplies when regulated outputs are needed. Zener diodes are cheap and they are also easy to use and as a result they are used in many applications and many circuits.
To prevent excess voltage to enter in a diode or LED etc
IN in IN4001 refers to the type of diode. The IN is a designation used by some manufacturers to indicate that it is an axial lead diode. The IN4001 is a commonly used diode in electronics, often used for rectifying AC signals in power supply circuits.
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The alternator diode rectifier converts the AC current being produced by the alternator to DC from which most of the electronics installed and battery use.
0a79 ( germanium diode )in glass construction form is used in AM detector circuits.
circuits go round
Actually it can be used as a diode, but rarely is. Just connect the grid and plate together and it has been reduced to a diode. There are also certain circuits that use the cathode and grid as a diode, while also obtaining an amplified output on the plate.
A capacitor is required in electronics when we are charging and frequency circuits.