"The Relationship between Current, Voltage and Resistance" Ohm's Law PPT Courseware 5

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"The Relationship between Current, Voltage and Resistance" Ohm's Law PPT Courseware 5

1. Introduction of topics

Please look at the following experiment and think about the problem

Please think: What can be done to dim the light bulb?

Method 1: Remove one battery

Method 2: Add resistance to the circuit

question:

The same light bulbs emit different amounts of light, indicating different currents flowing through them. Which current may be related to what factors?

What is the quantitative relationship between current, voltage, and resistance?

Tips: When using experiments to study the change of one quantity with two quantities, keep one quantity constant and study the relationship between the other two quantities. This is a useful method for studying physical problems.

Study 1: The relationship between current and voltage

Ask the question: What is the relationship between current and voltage?

Guess:

When the resistance in the circuit is constant, the greater the voltage, the higher the current.

Condition control:

Keep __ unchanged, change __, and study the relationship between current and voltage.

in conclusion:

The relationship between current, voltage and resistance can be expressed as

1: When the resistance is constant, the current in the conductor is proportional to the voltage across the conductor.

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

Conclusion 1:

When the resistance is constant, the current in the conductor is directly proportional to the voltage across the conductor.

To understand this relationship, attention should be paid to:

(1) The current in the conductor and the voltage across the conductor here are for the same conductor. It cannot be said that the current in one conductor is proportional to the voltage across the other conductor.

(2) It cannot be said the other way around. When the resistance is constant, the voltage is proportional to the current. There is a causal relationship here. Voltage is the cause and current is the effect. Because there is voltage at both ends of the conductor, there is current in the conductor. It is not because there is current in the conductor first and then voltage is added. The causal relationship cannot be reversed.

Conclusion 2:

When the voltage remains constant, the current in a conductor is inversely proportional to the resistance of the conductor.

To understand this relationship, please note:

(1) Current and resistance are also for the same conductor. Whoever's resistance affects the current. It cannot be said that the current of one conductor is inversely proportional to the resistance of another conductor.

(2) It cannot be said that the resistance of a conductor is inversely proportional to the current flowing through it. Because resistance is a property of the conductor itself, its size is determined by the conductor itself and has nothing to do with the current passing through the conductor.

The above relationships all have essential conditions, such as a certain resistance or a certain voltage, which cannot be ignored.

try it

1. When the voltage across a conductor increases several times, the current passing through it will _______; when the voltage across the conductor changes, the conductor resistance will _______.

2. In the experiment of "Studying the Relationship between Current, Voltage and Resistance", we first set the resistance to a certain value, change the resistance value of the sliding rheostat multiple times, record each current value and the corresponding ______ value, and get When the resistance remains constant, the current is proportional to ____. Then change the resistance value of the resistor several times and adjust the slider of the sliding rheostat so that ______ remains unchanged each time. Record the resistance value R and The corresponding ____ value is that the current is inversely proportional to _______.

3. Which statement about the relationship between voltage and current is incorrect ( )

A Voltage is what causes current in a circuit

B The current in a conductor is directly proportional to the voltage and inversely proportional to the resistance

C When the resistance is constant, the voltage across the conductor is proportional to the current

D When the resistance is constant, the conductor current is proportional to the voltage across the conductor

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"The Relationship between Current, Voltage and Resistance" Ohm's Law PPT Courseware 4:

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"The Relationship between Current, Voltage and Resistance" Ohm's Law PPT Courseware 3:

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"The Relationship between Current, Voltage and Resistance" Ohm's Law PPT Courseware 2:

"The Relationship between Current, Voltage and Resistance" Ohm's Law PPT Courseware 2 Review: 1. ______ is the cause of the formation of current; resistance represents _____________. Question: What is the specific relationship between current, voltage, and resistance? 2. Experiment Phenomenon: The small light bulb is...

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Update Time: 2024-10-13

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