"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT (Lesson 2)

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"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT (Lesson 2)

Part One Content: Basic Knowledge Key Points

Knowledge points: Laws of voltage in parallel circuits

1. In the circuit as shown in the figure, the two light bulbs glow normally, the power supply voltage is 3 V, and the voltage across L1 is 3 V; if L1 is damaged, L2 can (select "can" or "cannot") light normally.

2. Connect two light bulbs in parallel and connect them to the power supply. After closing the switch, you will find that L1 is brighter than L2, then (C)

The voltage across A.L1 is large

The voltage across B.L2 is large

C. The voltage across both ends of the two lamps is the same

D. The voltage across L1 is greater than the power supply voltage, and the voltage across L2 is less than the power supply voltage.

3. Figure A is a circuit diagram for measuring voltage. After closing the switch, the indications of the two ammeter pointers are as shown in Figures B and C. Then the voltages at both ends of L1 and L2 are (B)

A.0.5 V and 2.5 V B.2.5 V and 2.5 V C.2.5 V and 12.5 V D.0.5 V and 12.5 V

PPT on the rules of voltage in series and parallel circuits, part 2: improvement of comprehensive capabilities

4. In the circuit as shown in the figure, the power supply voltage remains unchanged. When the switch S is closed, L1 and L2 are both on, and the voltmeter indicates 3 V. When the switch S is opened, the voltmeter indicates ( C )

A. Increase to 6 V B. Decrease to 1.5 V

C. Keep 3 V unchanged D. Reduce to 0

5. In a circuit consisting of two light bulbs, a switch and a power supply (voltage is 4.5 V), after the switch is closed, both light bulbs light up. In the following statement (D)

①If the voltages of two light bulbs are equal, they must be connected in series

②If the voltages of two light bulbs are equal, they must be connected in parallel

③If the voltage of both bulbs is less than 4.5 V, they must be connected in series

④If the voltage of a light bulb is equal to 4.5 V, they must be connected in parallel

A. Only ①② is correct B. Only ①③ is correct

C. Only ②④ is correct D. Only ③④ is correct

6. As shown in the figure, when the switches S1 and S2 are both closed, the voltmeter indicates 4 V, then the voltage across the lamp L1 is (A)

A.4 V B.2 V C.1 V D.0

The law of voltage in series and parallel circuits PPT, the third part of the content: Expansion and exploration breakthroughs

7. In order to "explore the law of voltage in parallel circuits", the laboratory provides equipment: battery pack (voltage is 3 V), voltmeter, multiple small light bulbs, switches, and several wires.

(1) Please use stroke lines instead of wires, complete the circuit connection in Figure A, and require a voltmeter to measure the voltage at both ends of lamp L1;

(2) After the circuit is connected correctly, the experiment is carried out. A group measures the voltage at both ends of the lamps L1 and L2 and the total voltage of the parallel circuit. The voltage expressions are the same, as shown in Figure B, and the value is 2.6V. Based on this set of data, the team derived the rules of voltage in parallel circuits. You think the omission in the experiment is that the bulbs of different specifications were not replaced for multiple experiments;

(3) Xiaohua found that the voltage indicated in the experiment was significantly smaller than the power supply voltage. He believed that the reason for this phenomenon was that the wires shared the voltage. In order to verify whether the conjecture was correct, after closing the switch, Xiaohua measured the two voltages of the battery pack. The voltage at the terminal is 2.65 V. From this, it can be judged that the voltage divided by the wire is not (optional "yes" or "no"). The main reason why the voltage indicated is significantly smaller than the power supply voltage. The reason is that after closing the circuit, the voltage at both ends of the battery pack and the parallel connection The total voltage of the circuit differs very little.

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Update Time: 2024-06-07

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