"Series and Parallel Connections of Resistors" Exploring Circuit PPT Courseware

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"Series and Parallel Connections of Resistors" Exploring Circuit PPT Courseware

1. Explore the series connection of resistors

Ask the question: Is the total resistance of two resistors connected in series larger or smaller than the individual resistors in the series?

Conjecture and hypothesis: After several resistors are connected in series, it is equivalent to increasing _________, and the total resistance should be _________ than the resistance.

Methods: voltammetry, ________.

Conclusion: ________, expression: _________.

2. Explore the parallel connection of resistors

Ask the question: Is the total resistance of two resistors connected in parallel larger or smaller than the individual resistors in the parallel connection?

Conjecture and hypothesis: When several resistors are connected in parallel, it is equivalent to increasing _________, and the total resistance should be _________ than the resistance.

Methods: voltammetry, ________.

Conclusion: ____________________, expression: _________

Knowledge point 1: Resistance of series circuit

1. There are two resistors with resistance values ​​30 Ω and 10 Ω respectively. If they are connected in series, the total resistance is ()

A.40 Ω B.30 Ω

C.20 Ω D.7.5 Ω

2. Connect two resistors R1 and R2 with different resistances in series, then the total resistance ()

A. Between two resistors

B. Smaller than any resistor

C. Larger than any resistor

D. May be equal to one of the resistors

3. There are two resistors, R1=4 Ω and R2=6 Ω. If they are connected in series in the circuit, the currents passing through them are I1 and I2 respectively, and the voltages at both ends are U1 and U2 respectively, then I1∶I2= _____,U1∶U2=_____.

Knowledge point 2: Resistance of parallel circuit

4. In the circuit shown in the figure, the voltage U remains unchanged and after the switch S is closed, which of the following statements is correct ()

A. The ammeter reading increases

B. The reading of the ammeter decreases

C. The reading of the voltmeter increases

D. The reading of the voltmeter decreases

5. Connect the resistors R1=3 Ω and R2=6 Ω to the same circuit. Regarding their total resistance (equivalent resistance) value, among the following four options, the impossible one is ()

A.9 Ω B.2 Ω

C.9 Ω or 2 Ω D.3 Ω

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Update Time: 2024-08-12

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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