Electrical Properties

The video tutorial covers the concepts of metallic bonds and band theory, explaining how metals conduct electricity. It introduces semiconductors, detailing intrinsic and extrinsic types, and focuses on silicon's role. The process of doping to create P-type and N-type semiconductors is explained, along with their applications in electronic components like diodes and transistors. The video also explores photovoltaic cells and advanced semiconductor materials, highlighting their significance in modern technology.

What is the primary reason metals are good conductors of electricity?

• They have a high density of protons.

• Their atoms are closely packed.

• They have a sea of free electrons.

• Their atoms have a high atomic mass.

Where are semiconductors located on the periodic table?

• In the middle

• At the bottom

• On the left-hand side

• On the right-hand side

What is the process of adding impurities to intrinsic semiconductors called?

• Fusing

• Bonding

• Doping

• Mixing

What is the atomic number of silicon?

• 18

• 16

• 14

• 12

What type of bond is formed between silicon atoms in intrinsic semiconductors?

• Ionic bond

• Metallic bond

• Covalent bond

• Hydrogen bond

What is the role of the Fermi level in semiconductors?

• It determines the atomic mass.

• It is the top of electron energy levels at absolute zero.

• It is the midpoint of the valence band.

• It is the bottom of the conduction band.

In a P-type semiconductor, what is the majority charge carrier?

• Electrons

• Protons

• Neutrons

• Holes

What is a diode primarily used for?

• Signal detection

• Energy storage

• Rectification

• Amplification

What happens to electrons in a photovoltaic cell when they are energized by photons?

• They are absorbed by the cell.

• They move to the top of the cell.

• They move to the bottom of the cell.

• They become stationary.

Which of the following is a characteristic of transition metal oxides like titanium oxide?

• They are always non-conductive.

• They can behave like metals or insulators depending on temperature.

• They have fixed electrical properties.

• They always behave like insulators.