*Question T6C04:
What is component 3 in figure T-1?*  

*Correct Answer is  C: Lamp*  

### AI Response: (may contain errors)  

In question T6C04, we need to identify component 3 in figure T-1, which is indicated to be a lamp.

### Explanation of the Correct Answer:
- **Correct Answer: Lamp**
  - A lamp is typically represented in circuit diagrams by a specific symbol that resembles a circle with two lines extending from it, often indicating the filament or bulb. This symbol is distinct and recognizable in schematic representations.

### Explanation of Incorrect Answers:
- **A: Resistor**
  - A resistor is usually represented by a zigzag line or a rectangle in circuit diagrams. Since component 3 does not match this representation, it cannot be a resistor.

- **B: Transistor**
  - Transistors are represented by a combination of lines and circles, often with additional symbols indicating the type (NPN or PNP). The symbol for a transistor is quite different from that of a lamp.

- **D: Ground symbol**
  - The ground symbol typically looks like a set of horizontal lines stacked on top of each other or a triangle pointing downwards. This is not the shape associated with a lamp.

### Summary:
- The lamp is the correct answer because its symbol is distinct and recognizable in circuit diagrams.
- The other options are incorrect due to their unique symbols that do not match the representation of a lamp.

### Useful Tips:
- Familiarize yourself with common circuit symbols, as recognizing them is crucial for understanding schematics.
- Practice identifying components in various diagrams to reinforce your knowledge.