"Rheostats" voltage resistance PPT download

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"Rheostats" voltage resistance PPT download

Part One: Learning Objectives

1. Be able to tell the structure of the sliding rheostat, draw its symbol in the circuit diagram, and understand the working principle of the rheostat.

2. The sliding rheostat can be correctly connected to the circuit to change the current in the circuit and the voltage across the electrical appliances.

3. Know the applications of rheostat in daily life.

Rheostat PPT, Part 2: Learning content

1. Rheostat

A component that can change the resistance of an access circuit is called a rheostat.

2. Sliding rheostat

1. Working principle:

Changing the length of the resistance wire in the access circuit changes the access resistance, thereby changing the current.

2.Illustration:

(1) Physical picture:

(2) Structural diagram:

3. Practice using sliding rheostat

(1) Observe the structure of the sliding rheostat

(2) Connect the sliding rheostat

They should be connected in series in the circuit and connected to two binding posts, one in AB and one in CD, that is, "one up and one down".

(3) Experiment: Use a sliding rheostat to change the brightness of a small light bulb

Think about it: where should the slider be placed before connecting the circuit?

(4) Experiment: Use a sliding rheostat to control the voltage across the resistor

Close the switch S and adjust the slider of the sliding rheostat so that the voltage across the fixed value resistor R changes by an integral multiple.

Use a different fixed-value resistor to change the resistance by an integer multiple. Close the switch S and adjust the slider of the sliding rheostat to keep the voltage at both ends of the fixed-value resistor connected each time unchanged.

3. Application of rheostat

A rheostat that can express resistance value.

The rheostat is usually marked with the maximum resistance and the maximum current allowed to pass through it. When using it, it should be selected according to the needs. The current passing through the rheostat cannot exceed the maximum value, otherwise the rheostat will be burned out. Usually the resistance should be adjusted to maximum before use.

A digital potentiometer is a device (integrated circuit) that uses digital signals to control resistance.

Compared with mechanical potentiometers, digital potentiometers have the advantages of programmable resistance change, vibration resistance, low noise, long life, and resistance to environmental pollution.

Rheostat PPT, part 3: in-class training

1. Which of the following statements about sliding rheostat is correct ()

A. The sliding rheostat changes the conductor resistance by changing the cross-sectional area of ​​the conductor.

B. The sliding rheostat changes the conductor resistance by changing the material of the conductor.

C. Because the resistance of a conductor is related to the material, length, and cross-sectional area of ​​the conductor, the sliding varistor changes the resistance of the conductor by changing any of these factors.

D. The sliding rheostat changes the conductor resistance by changing the length of the conductor connected to the circuit.

2. As shown in the figure, when the slider is moved to the right, the resistance change effect is the same ()

A.A and B B.A and C

C.A and D.D.B and D

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For more information about the "Voltage Resistor Rheostat" PPT courseware, please click on the Voltage Resistance ppt Rheostat ppt tag.

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Update Time: 2024-06-25

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

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