- WHY DOSE A POSITIVE CHARGE ATTRACT A NEGATIVE CHARGE ?
Ans:It is a tendency of everybody have minimum electric
potential i.e., to obtain zero potential. A positive charge means deficit of
electrons while the negative charge indicates excess of electrons.
Consequently, positive and negative charges attract each other to have minimum
eclectic potential.
ELECTRICAL MATERIALS
The materials used in electricity and electronics can be
broadly divided into three major types.
- Conductor
- Semiconductor
- Insulator
Conductor (e.g copper, aluminum etc.) conduct current very
easily while insulators (e.g glass, mica, paper) practically conduct no current.
In other words, conductors have small resistivity and insulator have high value
of resistivity. The resistivity of semiconductors (e.g. germanium, silicon
etc.) lies between conductors and insulators.
CONDUCTOR
- Conductors are formed by metallic bonds. These bonds are based on structure positive metals ions surrounded by a clouded of electron.
- Conductors have positive temperature coefficient of resistance i.e their resistance increases with rise the temperature and vice- versa as mention in figure.
- Conductors are use to Carry current in the electric circuits.
SEMICONDUCTOR
- Semiconductors are formed by covalent bonds.
- Semiconductors have negative temperature coefficient of resistance i.e. their resistance decreases with the rise in temperature and vice versa as mention in figure.
- Semiconductors are used in manufacturing of electronics devices (e.g crystal diodes, transistor etc.)
INSULATOR
- Insulators are predominantly covalent compounds. The valances electrons are tightly locked with neighboring atoms are not available to support flow the current.
- Insulators have negative temperature coefficient of resistance i.e. their resistance decreases with rise of temperature and vice- versa.
- Insulators are used to confine the current to desired path.
https://infinitybus.blogspot.com/2020/01/infinity-science-studyconcept-of-emf-pd.html
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