Students label power sources as "Mains" or "Batteries" in an educational worksheet.

Problem Description:

The task is to label the power sources of various devices as either "Mains" or "Batteries." The goal is to identify whether each device typically uses electricity from a mains power supply (plugged into a wall socket) or batteries.

Solution Approach:

1. Understand the Power Sources:
- Mains: Devices that require a direct connection to an electrical outlet (wall socket) for power.
- Batteries: Devices that operate using internal batteries, which can be disposable or rechargeable.

2. Analyze Each Device:
- Carefully examine each image and determine the typical power source for that device based on common usage.

3. Label Each Device:
- Write "Mains" if the device typically uses a mains power supply.
- Write "Batteries" if the device typically uses batteries.

Step-by-Step Analysis:

#### Row 1:
1. Television:
- Typically plugged into a wall socket for power.
- Label: Mains

2. Vacuum Cleaner:
- Usually plugged into a wall socket for power.
- Label: Mains

3. Smartphone:
- Operates on internal batteries, which can be recharged by plugging into a mains charger.
- Label: Batteries

4. Analog Clock:
- Often powered by batteries, especially older models.
- Label: Batteries

#### Row 2:
5. Fan:
- Typically plugged into a wall socket for continuous operation.
- Label: Mains

6. Toy Car:
- Usually battery-operated for portability.
- Label: Batteries

7. Remote Control:
- Operates on small batteries (e.g., AAA or AA).
- Label: Batteries

8. Air Conditioner:
- Requires a high power supply and is always plugged into a wall socket.
- Label: Mains

#### Row 3:
9. Portable Radio:
- Can operate on batteries for portability but may also have a mains adapter.
- Label: Batteries (primary power source)

10. Flashlight:
- Typically battery-operated.
- Label: Batteries

11. Lamp:
- Usually plugged into a wall socket for power.
- Label: Mains

12. Printer:
- Typically plugged into a wall socket for power.
- Label: Mains

Final Labels:

Here is the completed labeling:

| Image | Label |
|-------------------|-------------|
| Television | Mains |
| Vacuum Cleaner | Mains |
| Smartphone | Batteries |
| Analog Clock | Batteries |
| Fan | Mains |
| Toy Car | Batteries |
| Remote Control | Batteries |
| Air Conditioner | Mains |
| Portable Radio | Batteries |
| Flashlight | Batteries |
| Lamp | Mains |
| Printer | Mains |

Final Answer:

\[
\boxed{
\begin{array}{|c|c|}
\hline
\text{Television} & \text{Mains} \\
\hline
\text{Vacuum Cleaner} & \text{Mains} \\
\hline
\text{Smartphone} & \text{Batteries} \\
\hline
\text{Analog Clock} & \text{Batteries} \\
\hline
\text{Fan} & \text{Mains} \\
\hline
\text{Toy Car} & \text{Batteries} \\
\hline
\text{Remote Control} & \text{Batteries} \\
\hline
\text{Air Conditioner} & \text{Mains} \\
\hline
\text{Portable Radio} & \text{Batteries} \\
\hline
\text{Flashlight} & \text{Batteries} \\
\hline
\text{Lamp} & \text{Mains} \\
\hline
\text{Printer} & \text{Mains} \\
\hline
\end{array}
}
\]