Draw a schematic diagram of a circuit consisting of a battery of three cells of `2 V` each, a 5 ohm resistor, an 8 ohm resistor, and a 12 ohm resistor, and a plug key, all connected in series.

Explanation

To draw a schematic diagram of the described circuit, follow these steps:

### Step 1: Draw the Battery
1. Start by drawing three cells in series. Each cell represents a 2 V battery.
2. Draw the first cell as a long rectangle with a positive (+) terminal on the top and a negative (-) terminal on the bottom.
3. Repeat this for the second and third cells, ensuring that the negative terminal of one cell connects to the positive terminal of the next cell.

### Step 2: Connect the Cells
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