Types of Cells Used in Wrist Watches
Wrist watches primarily use two types of cells: **quartz cells** and **button cells**. Understanding these cells helps in grasping how watches function efficiently.

1. Quartz Cells
- Quartz cells power most modern wrist watches.
- They use a small piece of quartz crystal that vibrates when an electric current passes through it.
- This vibration helps keep time accurately, making quartz watches very precise.
- They are long-lasting and require minimal maintenance.

2. Button Cells
- Button cells are small, round batteries commonly found in wrist watches.
- The most common type is the **SR (Silver Oxide)** and **LR (Alkaline)** batteries.
- These batteries provide the necessary energy to power quartz movements in watches.
- They vary in size, typically ranging from 10mm to 25mm in diameter.

3. Advantages of Quartz and Button Cells
- **Accuracy**: Quartz watches can lose or gain only a few seconds a month.
- **Convenience**: Button cells are easy to find and replace when they run out of power.
- **Affordability**: Quartz watches are generally more affordable than mechanical watches.

4. Conclusion
In summary, quartz and button cells are essential in wrist watches, ensuring they run smoothly and accurately. Understanding these components can enhance your appreciation for timekeeping technology.