"Rheostats" Voltage and Resistance PPT Courseware 2

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"Rheostats" Voltage and Resistance PPT Courseware 2

1. Resistance of conductor

1. Resistance: represents the resistance of a conductor to current flow

2. The greater the resistance of the conductor, the greater the obstruction to current flow.

3. The symbol of resistor in the circuit diagram

4. Unit of resistance: Ohm, symbol

5. Factors that affect conductor resistance: material, length, cross-sectional area, temperature

Note: The size of conductor resistance has nothing to do with the size of current and voltage. Resistance is a property of the conductor itself. That is to say, for the same conductor, the resistance remains unchanged regardless of temperature.

1. Rheostat

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

2. Sliding rheostat

1. Working principle: Change the length of the resistance line in the access circuit to change the access resistance, thereby changing the current.

2. Illustration

(1) Physical picture:

(2) Structural diagram:

(3) Component symbols:

Summary:

1. Connection method: series connection; one up and one down

2. Before closing the switch, the slider should be placed at the maximum resistance point.

3. The terminals at both ends of the metal rod are equivalent to the same terminal.

Class exercises

1. A sliding rheostat is a device that changes resistance by changing the ____________ connected to the circuit.

2. The words "20Ω1A" on the varistor nameplate:

1) Indicates that the maximum resistance of this varistor is ( ) Ω;

2)The resistance variation range is______Ω;

3) The maximum current allowed to pass is ______A.

4) When the slider P moves to the midpoint, the resistance value connected in the circuit is ( ).

5. As shown in the figure, when the sliding rheostat is connected to the circuit and the slider P slides to the right, the resistance of the circuit becomes larger. At this time, the terminal connected to the circuit should be ( )

(A) C and D (B) B and D (C) A and C (D) B and A

Class summary

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

2. The sliding rheostat changes the access resistance by changing the length of the resistance line in the access circuit, thereby changing the current. It should be connected in series in the circuit, and the wiring should be "one up and one down".

3. Potentiometer is the application of rheostat in daily life.

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For more information about the PPT courseware "Rheistor Voltage and Resistance", please click on the Rheostat ppt voltage and resistance ppt tags.

"Rheostats" PPT download:

"Rheistor" PPT download Part 1: Knowledge review 1. What physical quantity is resistance? Answer: Resistance is a physical quantity that represents the resistance of a conductor to current; the greater the resistance, the greater the resistance to current. 2. The factors that affect the size of the resistance are...

"Rheostats" PPT courseware:

"Rheistor" PPT courseware part one content: Rheostat 1. Rheostat: Principle of a device used to change the resistance: the size of the resistance changes with the length of the conductor. The maximum resistance value of this sliding varistor is 20, and the maximum current allowed is 2A. ..

"Rheostats" PPT:

"Rheistor" PPT Part One Content: Review Resistance (symbol: R) 1. Concept: The obstruction effect of conductors on current flow. The more resistant a conductor is to the flow of electricity, the greater its resistance. 2. Unit: ohm (ohm) (symbol: ) kiloohm (K), megaohm..

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Update Time: 2024-09-11

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 1 industry PPT template

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