Draw an open circuit that consists of 2 sets of 2 cells connected in series, connected in [arallel with each other. Add a variable resitance R1 in series with a set of 3 light bulbs r2, r3, r4 in parallel with each other. Insert an ammeter and a voltmeter in the circuit

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To draw an open circuit with the given components, follow these steps:

1. Start by drawing a horizontal line to represent the circuit.
2. Draw two sets of two cells connected in series on the left side of the line. Each set should consist of two cells connected in series, with the negative terminal of one cell connected to the positive terminal of the next cell.
3. Add a variable resistor (R1) in series with one of the sets of cells. Draw a resistor symbol (a zigzag line) in line with one set of cells, and label it as R1.
4. Next, draw three light bulbs (r2, r3, r4) in parallel with each other. This means that the positive terminals of all three bulbs are connected to each other, and the negative terminals are also connected to each other. Draw three bulb symbols (a circle with a zigzag line inside) in parallel below the line, and label them as r2, r3, and r4.
5. Connect the parallel combination of bulbs to the circuit by drawing lines from the positive and negative terminals of the set of cells without the variable resistor. These lines should connect to the positive and negative terminals of the parallel combination of bulbs, respectively.
6. Finally, add an ammeter and a voltmeter to the circuit. The ammeter should be connected in series with the variable resistor R1, so draw it in line with R1. The voltmeter should be connected in parallel across the combination of bulbs, so draw it across the parallel combination of r2, r3, and r4.

The resulting circuit diagram should resemble the following:

```
+---------+ +---------+
---| |---| |---
| | | |
---| R1 |---| r2, r3, |---
| | | r4 |
---| |---| |---
+---------+ +---------+
Ammeter Voltmeter
```

Remember to label each component correctly and ensure the correct connections are made based on the given description.