"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT (Lesson 1)

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT (Lesson 1)

Part One Content: Basic Knowledge Key Points

Knowledge points: Voltage rules of series circuits

1. The voltage provided by one dry cell is 1.5 V. If you need a power supply that provides 9 V voltage, you need to connect 6 dry cells in series.

2. In the circuit as shown in the figure, when the switch S is closed, the indications of the voltmeters V, V1, and V2 are U, U1, and U2 respectively. The correct relationship between them is (D)

A.U=U1=U2 B.U>U1+U2

C.U

3. (Guangxi High School Entrance Examination) As shown in the figure, when exploring the "relationship between series circuit voltages", after closing the switch S, the indication of voltmeter V1 is 2.5 V and the indication of V2 is 3.8 V, then the indication of voltmeter V3 The indication is (D)

A.1.3 V B.2.5 V

C.3.8 V D.6.3 V

4. As shown in the figure, the power supply voltage is 4.5 V. After closing the switch, the voltmeter reads 3 V. Which of the following statements is incorrect (A)

The voltage across A.Ll is 3 V

The voltage across B.Ll is 1.5 V

The voltage across C.L2 is 3 V

The sum of the voltages across D.Ll and L2 is 4.5 V

5. When "exploring the voltage rules of series circuits", use the circuit as shown in the figure. Close the switch S and use a voltmeter to measure the voltages across AB, BC and AC respectively. After recording the first set of data in the table, in order to obtain a more general rule, the next experimental steps are (C)

A. Connect two lamps in parallel for experiment

B. Remove one light bulb and keep only one light bulb for experiment

C. Replace the power supply with different voltages at both ends, replace with small light bulbs of different specifications, and then measure several sets of voltage values.

D. Change to another range of the voltmeter and measure another set of voltage values.

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

6. In the circuit shown in Figure a, when the switch is closed, the pointers of the two voltmeters deflect as shown in Figure b, and the voltage across the bulb L1 is 5.6 V.

7. In the circuit as shown in the figure, when the switch S1 is open and S2 is closed, the voltage is 4.5 V; when the switch S1 is closed and S2 is open, the voltage is 3 V, then the voltage across the bulbs L1 and L2 The voltages are 3V and 1.5V respectively.

8. As shown in the figure, the power supply voltage remains unchanged at 6 V. After closing the switch S, it is found that both lights do not light up. After careful inspection, it is found that the filament of the bulb L2 is broken, and other parts are normal. At this time, if you use a voltmeter to measure the voltage between two points a and b, the indication is 0 V; if you measure the voltage between two points b and c, the indication is 6 V.

9. As shown in the figure, when switch S is closed, both lights are off, the ammeter has no indication, but the voltmeter has indication, then the fault is (B)

A.Lamp L1 is disconnected B.Lamp L2 is disconnected

C. Lamp L1 is short-circuited D. Lamp L2 is short-circuited

10. As shown in the figure, after the switch is closed, the readings of voltmeters V1 and V2 are 4 V and 10 V respectively, then the voltage across the bulb L2 is (B)

A.4 V B.6 V

C.10 V D.14 V

11. As shown in the figure, when the switch is closed, the indications of voltmeters V1 and V2 are 2 V and 3 V respectively, then the voltages at both ends of L1 and L2 are respectively (C)

A.2 V　3 V B.3 V　2 V

C.2 V　1 V D.1 V　2 V

12. In the activity of "Exploring the Voltage Characteristics of Series Circuits", Xiao Ming designed the circuit diagram as shown in the figure.

(1) When connecting a circuit, at least 6 wires are required; small light bulbs with different specifications (optional "same" or "different") should be selected during the experiment;

(2) As soon as Xiao Ming connected the last wire, the two lights immediately glowed, which means that he did not turn off the switch when connecting the circuit;

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

13. In the experiment of "Exploring the Voltage in Series Circuits", Xiaohu connected the physical circuit as shown in the picture, and was about to close the switch for measurement. Xiaoming, who was in the same group, discovered that there was a problem with the circuit he connected.

(1) Please tell Xiao Ming the problem:

①The positive and negative terminals of the voltmeter are connected reversely;

②The voltmeter is not adjusted to zero.

(2) In this circuit, you only need to change one connection to measure the voltage at both ends of the lamp L2. Please put an "×" with a pen on the wire that needs to be changed, and draw the correct connection after the change. , be careful not to cross the wires;

(3) After Xiaohu changed the voltmeter to measure the voltage at both ends of the lamp L2, he closed the switch and the two lamps (both lamps have the same specifications) glowed. At this time, Xiaohu accidentally broke the glass shell of L1, and found that L1 went out, but L2 became brighter. Why is this? They speculated:

Conjecture 1: There may be an open circuit at L1;

Conjecture 2: There may be a short circuit at L1.

①According to the characteristics of the series circuit (optional "series" or "parallel") circuit, the first guess is incorrect;

② In order to find out whether the second guess is correct, Xiao Ming measured the voltage of the two lamps with a voltmeter. The experiment found that the voltmeter deflected significantly on both occasions, and the voltage across L1 was smaller than the voltage across L2, indicating that the second guess was incorrect (choose "correct" or "incorrect").

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