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

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

review:

1. ______ is the cause of electric current;

Resistance represents _____________.

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

2. Experiment

Phenomenon: The small light bulb is brighter when using two dry batteries (3V) than when using one dry battery (1.5V)

Guess: As the voltage across both ends of the same small light bulb (with constant resistance) increases, the current passing through it also increases.

Please design an experiment to verify the guess you just made:

Require:

1) Can measure the specific values ​​of current, voltage and resistance.

2) Be able to select appropriate experimental equipment and draw experimental circuit diagrams

3) Able to analyze and draw conclusions based on the obtained data

1. The relationship between current and voltage

1. Connect the circuit according to the circuit diagram

2. Keep the resistance R=5Ω unchanged, adjust the sliding rheostat so that the voltages at both ends of the resistor are 1V, 2V, and 3V respectively, and read the corresponding current values ​​at this time.

3. Fill in the data into the table and draw U and I images according to the data

4. Analyze the data and draw conclusions:

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

2. The relationship between current and resistance

1. Connect the circuit according to the circuit diagram

2. Adjust the sliding rheostat so that the voltage at both ends of the resistor remains U=3V. Change the resistors to R=5Ω, 10Ω, and 15Ω respectively, and read the corresponding current value at this time.

3. Fill in the data into the form

4. Analyze the data and draw conclusions:

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

Experimental results

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

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

Ohm's law:

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

Formula I = U / R

U represents the voltage across the conductor, in V

R represents the resistance of this section of conductor, in Ω

I represents the current passing through the conductor, in A

discuss:

1. What research methods did you learn in this lesson?

In this experiment, we are studying the relationship between I, U, and R. U and R are physical quantities that can be changed. Now, for the convenience of research, we first control one of the quantities to be constant. This method is called control. variable method.

2. In the experiment, what is the function of the sliding rheostat?

1) Change the voltage across the resistor under test

2) Change the current in the circuit

Feedback during class:

1. To study the relationship between current, resistance and voltage, use the circuit shown on the right. During the experiment, keep the resistance constant and keep the voltage constant. In the step of keeping the resistance constant, the experimental requirements are: ( )

A. Keep the position of the sliding blade of the sliding rheostat R’ unchanged.

B. Keep the voltage across the resistor box R unchanged

C. Keep the fixed resistance value unchanged and adjust the slider of R’ to different appropriate positions.

D. Keep the current in the circuit constant.

2. In the experiment above, in the step of keeping the voltage constant, the experimental requirements ( )

A. Use a power supply with a different voltage and adjust the slider of R’ to keep the voltage on R unchanged.

B. Change the size of resistor R, adjust the slider of R’, and keep the voltage across R unchanged.

C. Adjust the slider of R’ to the appropriate position so that the voltage across R remains unchanged.

D. Adjust the slider of R’ to the appropriate position so that the voltage across R’ remains unchanged.

3. When the voltage across a fixed-value resistor is 3 V, the current passing through it is 0.4 A. If the voltage across it is 6 V, use an ammeter with a range of 0.6 A to measure the current passing through the fixed-value resistor. judge( )

A. Yes B. No C. Unable to determine

Consolidate and sublimate:

1. When a student was doing an experiment to study the relationship between current, voltage, and resistance, he obtained the following two sets of data:

1) Analyzing the data in the table on the left, we can conclude that when the resistance is constant, the current in the conductor is proportional to the voltage across the conductor.

2) Analyzing the data in the table on the right, it can be concluded that when the voltage remains constant, the current in the conductor is inversely proportional to the resistance of the conductor.

3) Based on the above conclusions, it can be concluded that the current in a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor

2. When a voltage of 2 V is applied to both ends of a conductor, the current flowing through is 0.5A. If the voltage at both ends of the conductor increases to 10 V, then ( )

A. Both the resistance of the conductor and the current passing through the conductor increase.

B. The resistance of the conductor and the current passing through the conductor become smaller.

C. The resistance of the conductor and the current passing through the conductor remain unchanged.

D. The resistance of the conductor remains unchanged and the current through the conductor increases.

3. While keeping the circuit voltage constant, when the resistance of the circuit increases to twice its original value, the current through the circuit ____ to its original ____.

4. In the experiment to study the relationship between current, voltage and resistance, the following data were obtained. Please fill in the data in the blank spaces in the table based on the conclusions obtained from the experiment.

Discuss and complete after class:

1. What experience did you learn from the experiment in this lesson?

2. Complete the tutorial

3. Complete Research 7 on page 28 of the Experimental Research Report Booklet

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Update Time: 2024-08-30

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