"Exploring Ohm's Law" PPT courseware 3

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"Exploring Ohm's Law" PPT courseware 3

New course introduction

Observe experiments and answer questions

1. What does it mean when the brightness of the same light bulb changes?

-----The current through the light bulb changes

2. So what causes the change in current?

guess:

1. The size of the voltage may affect the current.

2. The size of the resistor may affect the current.

Organize ideas

1. Changes in voltage → changes in current → changes in brightness

2. Change in resistance → change in current → change in brightness

→The current in a conductor is related to voltage and resistance.

→What is the specific relationship between current and voltage, current and resistance?

1. Experimental exploration: the relationship between current and voltage

Experimental method: Control variable method

What is the invariant that should be controlled in the experiment?

Which quantity should be changed in the experiment?

How to achieve voltage change?

Experimental equipment: power supply, switches, wires,

Ammeter, voltmeter, fixed value resistor, sliding rheostat

2. Experimental exploration: the relationship between current and resistance

Experimental method: Control variable method

What is the invariant that should be controlled in the experiment?

Which quantity should be changed in the experiment?

How to achieve a change in resistance?

How to control the invariant voltage to remain unchanged?

Experimental equipment: power supply, switch, wire, voltmeter, ammeter.

Several fixed value resistors and sliding rheostat with different resistance values

Knowledge summary:

Conclusion 1: When the resistance of the conductor is constant, the current passing through the conductor is proportional to the voltage across the conductor.

Conclusion 2: When the voltage of the conductor is constant, the current passing through the conductor is inversely proportional to the resistance of the conductor.

Summarizing conclusions 1 and 2, we can get:

The current in a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor.

Exercise 1

In the experiment to study the relationship between constant voltage and current and resistance, two data in the table are missing. Please fill in the two spaces in the table based on the experimental conclusions.

Exercise 2

1. It is known that R1=3R2, connect R1 and R2 to the 6 V power supply respectively, and the current ratio I1:I2 passing through them is equal to ( )

A. 1:3B． 3∶1 C. 2:1 D. 4:1

2. If a conductor is connected to a circuit and the voltage across it is increased to three times its original value, which of the following statements is correct ( )

A. It has three times the resistance

B. its current remains the same

C. Its current is one third of the original

D. It has three times the current

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Update Time: 2024-11-22

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 1 industry PPT template

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