"Rheostats" voltage resistance PPT courseware download

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"Rheostats" voltage resistance PPT courseware download

Part One Content: A Classification Practice of Knowledge Key Points

Knowledge point 1 Rheostat

1. As shown in the circuit in Figure 16-4-1, one end of wire a is fixedly connected to the pencil lead. When one end of wire b moves left and right on the pencil lead, the brightness of the bulb will change. This experiment shows that the pencil lead is _____ (optional "conductor" or "insulator"), and also shows that the resistance of the conductor is related to ____________. Inspired by this, people created a component that can change the resistance in the circuit, called ________.

2. The sliding rheostat changes ______ by changing the ____ of the resistance wire connected to the circuit, thereby changing the ______ in the circuit. There is a nameplate on the sliding head of the sliding rheostat. The current and resistance values ​​are marked on the nameplate, as shown in Figure 16-4-2. Among them, 50 Ω means ____________________ and 1.2 A means ____________________.

3. When using a sliding rheostat, you should master the following points: ① When using it, you should choose one from the upper terminal and the lower terminal to connect to the circuit, that is, "________" connection. Connecting the upper two binding posts to the circuit is equivalent to connecting a _________, and connecting the lower two binding posts to the circuit is equivalent to connecting a _______________. In both cases, the sliding rheostat is The resistance connected to the circuit cannot be changed. ② Before the circuit is connected, the slider should be placed at the ________ position where the resistance of the varistor is connected to the circuit. ③When using, the current passing through the rheostat cannot exceed the ________ current allowed to pass through, otherwise it will ____________________.

4. Some experimental instruments have a regulatory effect. The following sliding rheostat has different wiring methods in the circuit. Among them, the one that can adjust the circuit is ()

5. Figure 16-4-4 shows the structure of the sliding rheostat and the schematic diagram of the connected circuit. When the slider P slides to the left, the resistance connected to the circuit becomes larger ()

6． As shown in Figure 16-4-5, a sliding rheostat should be connected between two points M and N. Requirement: When switch S is closed and the slide moves to the left, the bulb gradually dims. Then the correct connection method of the sliding rheostat is ()

A． M then a, N then c

B． M is connected to b, N is connected to c

C. M then a, N then d

D. M connects to a, N connects to b

Knowledge point 2 Application of rheostat

7． Among the following electrical appliances, the one that does not require a rheostat is ()

A． adjustable temperature iron

B． Infinitely dimmable desk lamp

C. Radio volume adjustment knob

D. household incandescent lamp

8. A potentiometer is essentially a type of ________ (optional "resistor" or "rheostat"). As shown in Figure 16-4-6, if you connect it in series with the light bulb and use it to change the brightness of the light bulb, please observe carefully. If you want to make the sliding contact rotate clockwise and the light bulb becomes brighter, you should connect the two The terminals are ________, ________.

9. The reading of the resistance box in Figure 16-4-7 is ________Ω.

10. In the circuit shown in Figure 16-4-8, when all the copper plugs of the resistance box are inserted, the resistance value of the resistance box connected to the circuit is ______Ω; when all the copper plugs are pulled out, the resistance value of the resistance box connected to the circuit is The resistance value is ______Ω. At this time, the current passing through the 5Ω resistance wire is 0.5 A, and the current passing through the resistance box is ________A.

Rheostat PPT, Part 2: Comprehensive practice of B-law method

11. Observe the sliding rheostat shown in Figure 16-4-9. Among its various components, all of them are conductors ()

A． Slider and Resistor Wire

B． Porcelain cylinder and metal bracket

C. Plastic knobs on metal rods and binding posts

D. The metal ring that fixes the resistance wire and the insulating paint on the coil

12. In the circuit shown in Figure 16-4-10, the power supply voltage remains unchanged. When the switch is closed, when the slide of the sliding rheostat slides to the right, the following analysis is correct ()

A． The light bulb becomes brighter and the ammeter reading becomes larger

B． The light bulb dims and the ammeter reading becomes smaller

C. The brightness of the light bulb remains unchanged, and the ammeter reading becomes larger.

D. The brightness of the light bulb remains unchanged, but the ammeter reading becomes smaller.

13. Connect the two sliding varistors in series as shown in Figure 16-4-11. If the two wires a and b are connected to the circuit, the total resistance of the two varistors must be maximized. The positions of the sliding plates P1 and P2 yes()

A． P1 is at the far right and P2 is at the far left

B． P1 is at the far left, P2 is at the far left

C. P1 is at the far left and P2 is at the far right

D. P1 is at the far right, P2 is at the far right

14. Figure 16-4-12 shows several options for adjusting the brightness of a light bulb using a sliding rheostat. The solution you think can achieve the goal is ()

15． A classmate designed a wind force measuring instrument, as shown in Figure 16-4-13. O is the rotation axis, OC is the metal rod, and a wind receiving plate is connected below. When there is no wind, OC is vertical. The stronger the wind, the stronger the wind force. , the greater the deflection angle of rod OC; AB is a section of arc-shaped resistor, point P is the contact point between the metal rod and the arc-shaped resistor. There is a small light bulb connected in the circuit. When measuring the wind force, close the switch S. Through analysis, it can be seen that the combination of metal rod OC and arc resistor AB is equivalent to a __________. Observing ________ can roughly reflect the magnitude of the wind force. To improve the performance of the device in reflecting wind strength, one approach is to ____________________.

Rheostat PPT, the third part: Practical practice of C high-frequency examination questions

17. [2016·Adapted from Zigong] As shown in Figure 16-4-15, the power supply voltage is 6 V. Use stroke lines instead of wires to connect the components in the picture to form a circuit. Requirement: A voltmeter measures the voltage across a light bulb. When the slider of the sliding rheostat moves to the left, the light bulb becomes brighter.

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

"Circuit Connection and Analysis Including Electric Meter and Sliding Rheostat" Voltage Resistance PPT:

"Circuit Connection and Analysis Including Electric Meter and Sliding Rheostat" Voltage Resistor PPT Type 1 Circuit diagram based on actual drawing 1. Please draw the corresponding circuit diagram in the dotted box based on the actual picture. 2. According to the actual picture shown in Figure ZT-3-2A, in the dotted line frame of Figure B...

"Rheostats" voltage resistance PPT teaching courseware:

"Rheistor" Voltage Resistance PPT Teaching Courseware Part One: Guidance Design Learning Point 1 Rheostat Question 1: What methods do you have to change the current in a circuit? Answer: Change the _________ at both ends of the circuit or change the _________ in the circuit. Question 2:..

"Rheistor" voltage resistance PPT download:

"Rheistor" Voltage Resistance PPT Download Part One Content: 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. Be able to correctly connect the sliding rheostat into the circuit to change the current in the circuit..

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Update Time: 2024-10-02

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