Lesson Plan (Diode)

Semiconductors Lesson no. 8

Unit no. 1

DIODE

1. Time

1:30 Hours

2. Materials:

Silicon Diode

Zener Diode

Tunnel Diode

Varactor Diode

Light Emitting Diode

3. Objectives:

• Identify types of Diodes
• Explain and give details the function of Diode
• Classify the solid states Diodes

4. The Set:

Last class time, you completed a pre-test in valence electrons. Today we are going to continue to build on your vocabulary skills. Our objective for today is, “The student will able to analyze the function and application of a diode.”

5. Instructional Component:

5.1 Introductory Information

Diode is a two-terminal electronic component that conducts electric current in only one direction. The term usually refers to a semiconductor diode, the most common type today. This is a crystalline piece of semiconductor material connected to two electrical terminals.

5.2 Classification of Diodes

• Vacuum tube diode used in some high-power technologies; is a vacuum tube with two electrodes: a plate and a cathode.
• Semiconductor diode – the most common type of diode, which compose of semiconductor materials; this type of diode is also known as solid state diode.
• Thermionic diodes are thermionic-valve devices (also known as vacuum tubes, tubes, or valves), which are arrangements of electrodes surrounded by a vacuum within a glass envelope. Early examples were fairly similar in appearance to incandescent light bulbs.

5.3 Function of Diode

The most common 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). Thus, the diode can be thought of as an electronic version of a check valve. This unidirectional behavior is called rectification, and is used to convert alternating current to direct current, and to extract modulation from radio signals in radio receivers.

5.4 People Involved

• Frederick Guthrie discovered Thermionic diode
• Thomas Edison independently rediscovered the principle of diode
• John Ambrose Fleming realized that the Edison effect could be used as a precision radio detector.
• Jagadish Chandra Bose was the first to use a crystal for detecting radio waves in 1894.
• Greenleaf Whittier Pickard - invented a silicon crystal detector in 1903.

6. Independent Practice:

Procedures:
A. Bell work (5 min)
B. Set (7 min)
C. Have students take out binder to take notes. Ask students to write down guesses and meaning.
D. Display each word (e.g. Zener diode, etc…) and ask for guesses. Use electronics dictionary to check answers. (25 min)
E. After the third examples, ask students to make their own guesses and discuss their answers.
F. Closure. (4 min)
G. Assign homework: Application of Diode

7. Questions:

1. What is vacuum tube diode?

2. Who can tell me what is the main function of diode?

3. Who can tell me some classification of solid state diodes?

Prepared by:

G-one T. Paisones