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The task is to select the correct electric circuit to measure \( U_2 \) from the provided three circuit diagrams. Let's analyze the diagrams step by step.

The diagrams contain two bulbs (marked as 1 and 2) and a voltmeter (marked as \( V \)) in different configurations:

1. **Circuit 1**: The voltmeter is connected across the first bulb (labeled 1).
2. **Circuit 2**: The voltmeter is connected across the second bulb (labeled 2).
3. **Circuit 3**: The voltmeter is connected across both bulbs in series.

To measure \( U_2 \) (the voltage across the second bulb), the correct circuit is **Circuit 2**, where the voltmeter is directly across the second bulb.

Thus, the correct answer is **2**.

Would you like more details or have any further questions? Here are 5 related questions to expand your understanding:

1. What is the principle behind using a voltmeter to measure voltage in a circuit?
2. How does connecting a voltmeter in series versus parallel affect the measurement?
3. Why is it important to measure voltage across specific components rather than the whole circuit?
4. Can you explain how resistance affects voltage across individual components in a series circuit?
5. What are the key differences in analyzing circuits with one versus multiple components?

**Tip:** Always ensure that the voltmeter is connected in parallel with the component across which you want to measure the voltage.

Оберіть схему відповідного електричного кола для визначення U_2.

Learn how to select the correct electric circuit for measuring the voltage across a specific component (U_2). This problem covers basic concepts of electric circuits, voltmeters, and their configurations in series and parallel. Suitable for high school students.

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