Question

Explain conductor, insulator, and semiconductor with examples.

Hint:

Semiconductors form the foundation of electronic circuits. Silicon (Si) is the most widely used semiconductor in microchips and solar cells.

Answer 1

1. Conductors:
Conductors are materials that allow electric current to pass through them easily due to the presence of free electrons. They have low electrical resistance.
Examples:
- Metals such as Copper (Cu), Silver (Ag), and Aluminum (Al)
- Graphite (a form of carbon)
- Saltwater (electrolytes)
Properties of Conductors:
- High electrical and thermal conductivity.
- Allow the free flow of electric charges.
- Used in electrical wiring and transmission lines.
2. Insulators:
Insulators are materials that do not allow the flow of electric current because they lack free electrons. They have high electrical resistance.
Examples:
- Rubber, Plastic, and Glass
- Dry Wood
- Air and Pure Water
Properties of Insulators:
- High resistance to electric current.
- Used for insulation in electrical wiring.
- Prevent electrical shock and leakage.
3. Semiconductors:
Semiconductors are materials that have electrical conductivity between conductors and insulators. Their conductivity can be altered by adding impurities (doping) or changing environmental conditions like temperature and light.
Examples:
- Silicon (Si)
- Germanium (Ge)
- Gallium Arsenide (GaAs)
Properties of Semiconductors:
- Their conductivity increases with temperature.
- Used in electronic devices such as transistors, diodes, and integrated circuits (ICs).
- The basis for modern computing and communication technology.