{"id":149604,"date":"2022-04-25T12:30:39","date_gmt":"2022-04-25T07:00:39","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=149604"},"modified":"2023-04-02T20:25:00","modified_gmt":"2023-04-02T14:55:00","slug":"diode-cbse-12th-board-physics-explanation","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/diode-cbse-12th-board-physics-explanation\/","title":{"rendered":"Diode: CBSE 12th Board Physics Explanation"},"content":{"rendered":"

A diode is an electrical component having two terminals that conducts electricity in one direction (assuming it functions at a specific voltage level). It only conducts electricity in one way when a particular minimum potential difference or voltage is supplied to its two terminals. It’s a two-terminal electrical component with low (preferably zero) resistance to current flow in one direction and high (ideally infinite) resistance in the other. A diode’s most common function allows electrical current to flow in one direction (called forward current in diodes) while blocking it in the other (reverse direction). If you’re studying this topic for <\/span>NEET<\/span><\/a> 2022, <\/span>JEE Main<\/span><\/a> 2022, or <\/span>JEE Advanced<\/span><\/a> 2022, don’t forget to look through the following syllabus for an overview. Locate an <\/span>Aakash Coaching Institute<\/span><\/a> near you for a greater grasp of diodes.<\/span><\/p>\n

What is a Diode?<\/h3>\n

A diode is made up of two words: “Di” means “two,” and “Ode” means “electrodes”; therefore, a device or component with two electrodes is called a diode. A diode or a p-n junction diode is an important component in a circuit that transforms alternating current to direct current since it only allows electricity to travel in one direction (rectification). Current will flow if a larger external voltage is added in the opposite direction of the built-in potential. Therefore most diodes are deemed “on” because they have an external forward bias.<\/span><\/p>\n

On the other hand, Diodes have very low resistance in one direction (to enable current to flow) and very high resistance in the other (to prevent current flow). The high resistance to current flowing in the reverse direction of the diodes is significantly decreased to an extremely low resistance when the reverse voltage across the forward-biased diode reaches a value known as the breakdown voltage. Because the holes and electrons reject one another and expand the depletion zone when the terminals are switched (reverse biased), no current flows through the p-n junction diode. <\/span>Click here<\/span><\/a> for a more detailed explanation of basic physics concepts.<\/span><\/p>\n

Diode Structure<\/span><\/h3>\n

On one side of the diode, the silver line is the cathode terminal (the top of the triangle is the cathode). On the other side, the <\/span>anode<\/b> in the forward-biased situation is the arrowhead, which symbolises the direction of conventional current flow.\u00a0<\/span><\/p>\n

The current passing through the diode has zero resistance in one direction to the cathode and anode but has a very high resistance in the other, causing the current to flow to zero. A white or black line on most diodes represents the cathode, where electrons will flow when the diode conducts.<\/span><\/p>\n

Types of Diodes<\/span><\/h3>\n

The diode is <\/span>forward-biased<\/b> when the anode voltage is greater than the cathode voltage, and it conducts readily with a minimal voltage drop. The potential energy across the p-type material is positive, while the potential energy across the n-type material is negative.<\/span><\/p>\n

The diode is <\/span>reverse-biased<\/b> when the cathode voltage is higher than the anode voltage. The voltage is depleted, and the potential energy across the p-type material is negative, while the potential energy across the n-type material is positive.<\/span><\/p>\n

Silicon or germanium are the most common semiconductor materials used in diodes.<\/span><\/p>\n

Also See: CBSE Class 12 Board Exam<\/a> | CBSE Class 12 Board Exam Syllabus<\/a> | CBSE Class 12 Physics SYllabus<\/a><\/p>\n

Functions and Applications of a Diode<\/span><\/h3>\n