Semiconductor Materials

The label semiconductor itself provides a hint as to its characteristics. The prefix semi-is normally applied to a range of levels midway between two limits. The term conductor is applied to any material that will support a generous flow of charge when a voltage source of limited magnitude is applied across its terminals. An insulator is a material that offers a very low level of conductivity under pressure from an applied voltage source. A semiconductor, therefore, is a material that has a conductivity level some-where between the extremes of an insulator and a conductor

Adulthood stage

Early adulthood
begins in late teens/early 20year and lasts through the 30 year. 
Early adulthood is a time of:
establishing personal and economic independence
developing a career

Adolescent stage

Adolescence :  Is a transition period from childhood to adulthood. It is based on childhood experiences
and accomplishments. It begins with the appearance of secondary sex characteristics and ends when
somatic growth is completed and the individual is psychological mature. 
Physical growth:
Weight:

School age Stage

School Age
School-age period is between the age of 6 to 12 years. The child's growth and development is Characterized by gradual growth . 
Physical Development
Weight:
School–age child gains about 3.8kg/year.

Preschool Stage

PRESCHOOLERS STAGE
It is the stage where child is 3 to 6 years of age. The growth during this period is relatively slow.
Physical growth:-
➢ Weight: The preschooler gains approximately 1.8kg/year.
➢ Height: He doubles birth length by 4–5 years of age . 
PHYSICAL DEVELOPMENT

flip-flop

The logic gates (AND, OR, NAND, NOR, INVERT) used in combinational logic. we will deal with data storage circuitry that will latch on to (remember) a digital state (1 or 0).

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