"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware 2

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"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware 2

Ohm's law and its applications

1. Content: The current in a conductor is _____ with the voltage across the conductor, and _____ with the resistance of the conductor.

2. Formula: I=U/R, the meaning and unit of each letter in the formula are: U—Voltage—_____( ); R—Resistance—_____(); I—Current—_____().

3. Application: If I and R are known, you can use the formula _____. If you know U and I, you can use the formula _____.

Correctly understand and apply Ohm's law formula I=I=U/R

1. Correspondence of I, U, R: The formula expresses the relationship between I, U, and R on the same section of conductor. I, U, and R refer to the corresponding physical quantities on the "same section of conductor" in the circuit. , must not be arrogant.

2. Formula deformation: U=IR and R=U/I. These two deformation formulas are often used when applying Ohm's law to solve problems.

3. Unified units: When using Ohm's law and its deformation formula to perform relevant calculations, it should be noted that the units of I, U, and R are A, V, and Ω respectively. If the units given in the question are not the above-mentioned units, you generally need to perform unit conversion before substituting them into the formula calculation.

4. Meaning of the formula: It reveals a restriction relationship that "the current in a conductor is determined by the voltage at both ends of the conductor and the resistance of the conductor", that is, the size of the current passing through a certain section of conductor is the result of the joint action of voltage and resistance.

1. As shown in the picture, use pencil lead to make a sliding rheostat. Moving the copper ring at the left end can change the length of the pencil lead connected to the circuit. When the copper ring slides from end A to end B, the change in voltage indication and the brightness of the small bulb is ()

A. The V indication becomes smaller and the light becomes brighter B. The V indication becomes larger and the light becomes brighter

C. The V indication becomes smaller and the light becomes darker. D. The V indication becomes larger and the light becomes darker.

2. Connect a piece of resistance wire to the 3 V power supply and measure the current passing through it to be 0.3 A. If the resistor is connected to another power supply and the current passing through it is measured to be 0.2 A, then the power supply voltage and the resistance of the resistor at this time are ()

A.2 V　15 Ω B.3 V　10 Ω

C.2 V　10 Ω D.3 V　5 Ω

3. After a large number of experiments, the German physicist Ohm concluded that the current in a conductor is directly proportional to ______ and inversely proportional to ______. The expression is ______. The units of U, I, and R are ______, ______, ______.

4. Connect a pencil lead to both ends of the 3 V power supply, and the current through the pencil lead is measured to be 0.15 A. Then the resistance of the pencil lead is ______; if the voltage across the pencil lead is increased to 6 V, Then the current passing through it is ______.

5. It is known that the safe voltage of the human body is not higher than 36 V. When the current passing through the human body approaches 30 mA, life will be in danger. It can be inferred from this that the human body is ______ (fill in "conductor" or "insulator"), and the resistance of the human body is about ______.

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Update Time: 2024-08-06

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