Give two examples of each of conductor insulator and semiconductor.

Answer

To answer the question, we will categorize materials into conductors, insulators, and semiconductors, providing two examples for each category.

### Step-by-Step Solution:

1. **Identify Conductors**:
- Conductors are materials that allow the flow of electric current due to the presence of free electrons.
- **Examples**:
- **Copper (Cu)**: Widely used in electrical wiring due to its excellent conductivity.
- **Aluminum (Al)**: Commonly used in power lines and various electrical applications.

2. **Identify Insulators**:
- Insulators are materials that do not conduct electricity, as they lack free electrons.
- **Examples**:
- **Plastic**: Used as insulation around wires to prevent current leakage.
- **Wood**: A natural insulator that does not conduct electricity under normal conditions.

3. **Identify Semiconductors**:
- Semiconductors are materials that have electrical conductivity between that of conductors and insulators. Their conductivity can be altered by adding impurities (doping) or changing temperature.
- **Examples**:
- **Silicon (Si)**: The most widely used semiconductor in electronic devices.
- **Germanium (Ge)**: Another important semiconductor used in transistors and diodes.

### Summary of Examples:
- **Conductors**: Copper, Aluminum
- **Insulators**: Plastic, Wood
- **Semiconductors**: Silicon, Germanium