"Ohm's Law" PPT courseware 2

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"Ohm's Law" PPT courseware 2

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In the first section we learned:

When the resistance of a conductor is constant, the current through the conductor is ______ with the voltage across the conductor;

When the voltage across a conductor is constant, the current flowing through the conductor is ______ with the conductor's resistance.

As early as the 1820s, the German physicist Ohm conducted a large number of experimental studies on the relationship between current, resistance and voltage. He found that for most conductors, the above law is true, and further summarized it: Ohm's law.

1. Ohm's law content:

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

2. The mathematical expression of Ohm’s law:

I =U/R

3. Notice:

Use international units in formulas (units must be unified);

Ohm's law reflects the relationship between I, U, and R in the same circuit at the same time.

Class exercises

1. Try to complete the following table according to Ohm's law.

2. When the voltage across a conductor is 2V, the current passing through the conductor is 500mA, and the resistance of this conductor is ____Ω. After the power supply is cut off, the voltage across the conductor is zero, and the resistance of the conductor at this time is ___Ω.

3. From Ohm's law I =U/R, the variant form R=U/I can be derived. For this expression, the correct statement below is ( )

A. The greater the voltage applied across the conductor, the greater the resistance of the conductor.

B. The greater the current passing through a conductor, the smaller the resistance of the conductor

C. The resistance of a conductor is a property of the conductor itself and has nothing to do with voltage or current.

D. The resistance of the wire is very large when the current is reduced to zero

4. The resistance of a certain wire is 0.08Ω. If it is accidentally connected directly to the two poles of a dry battery and a short circuit occurs, the short circuit current will be ____A.

Class summary

1. Content: The current in a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. This law is called Ohm's law.

2. Formula: I =U/R

Transformation formula: U=IR R=U/I

3. Note:

(1) Units in the formula;

(2) Each physical quantity in the formula must correspond one to one;

(Must correspond to the same circuit section)

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Update Time: 2024-07-30

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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