How does a sliding rheostat change the voltage at both ends of the resistor How to keep the voltage

Are you talking about adjusting the sliding rheostat in a series circuit that causes a change in the voltage at both ends of the other resistor? When studying the relationship between resistance and current, how to keep the voltage at both ends of the resistor unchanged?

If yes, then understand it this way:

In a series circuit, the sliding rheostat is R1, and the other resistance is R2, R1:R2=U1:U2, adjusting the rheostat causes the resistance ratio to change, then the voltage ratio will also change.

When studying the relationship between resistance and current, it is necessary to keep the voltage at both ends of the resistor unchanged, if the resistance R2 is replaced with a larger one, then U2 will also become larger, what should I do? As long as r1 is also larger, so that the ratio of r1:r2 is maintained in the original ratio.

A sliding rheostat can change its own resistance when it slides, and the current flowing through it in the circuit will also change due to the change in the resistance it is connected to in the circuit, according to Ohm's law

The current in the conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance.

It can be known that when the current in the circuit changes, U=IR, so the voltage at both ends of the resistor changes.

In a series circuit, the sliding rheostat is voltage divider, and the voltage at both ends of it can only be changed when it is connected in series in the circuit.

When the slide is kept still, the resistance does not change and the current does not change, so the voltage does not change.

Can you understand this?

The sliding rheostat is connected to the circuit, and the resistance value of the sliding rheostat is changed to change the voltage.

The question is a little more detailed. What does the voltage at both ends stay the same?

First of all, correct a little, slide the rheostat.

It is possible to change the voltage at both ends of the electrical appliance connected to it, but not the power supply voltage.

For example, a sliding rheostat is connected in series with a constant-value resistor across a power supply with a constant voltage. When the sliding rheostat slide moves, the resistance value of its own access circuit changes, resulting in a change in the total resistance of the circuit, which is determined by Ohm's law.

It can be known that if the total voltage does not change, the total resistance changes, which will inevitably lead to a change in the total current in the circuit. Then apply Ohm's law to the fixed-value resistance: the resistance of the fixed-value resistance does not change, and the current passing through it changes, so that the voltage at both ends of the fixed-value resistance must change.

In this way, the sliding rheostat achieves the effect of changing the voltage at both ends of the fixed value resistor.

From a scientific point of view, this phenomenon is that the sliding rheostat can change the resistance value in the connected line, so that the voltage in the line is redistributed and the voltage at both ends of the electrical Huaizhou hall is changed.

The main reason is that when the total resistance in the line changes, the total current in the line changes because the total voltage does not change.

In more detail, in the case of a change in the total current, the current through each appliance also changes, resulting in a change in the voltage at both ends of the appliance.

It can also be explained by the principle of partial pressure derived from Ohm's law. When the resistance value of the sliding rheostat changes, the hidden voltage of the lead also changes, and the voltage division of each consumer in the circuit changes when the total voltage remains unchanged.

The reason why the sliding rheostat can regulate the voltage: The sliding rheostat is an important element in the circuit, which can change its resistance by moving the position of the sliding blade, so as to play the role of controlling the circuit.

The functions are as follows: 1. The current in the circuit can be changed by changing the resistance of the access circuit part, so as to change the voltage at both ends of the conductor (electrical appliance) connected in series. When connecting a sliding rheostat, it is required:

One up and one down, the focus is on the bottom", a binding post is used for each metal rod and resistance wire; The actual connection should be selected according to the requirements of the two binding posts of the resistance wire.

2. Pray for the function of the protection circuit, that is, before connecting the circuit and opening and closing, the sliding plate P of the sliding rheostat should be adjusted so that the resistance of the sliding rheostat connected to the circuit part is maximized.

3. The voltage can be changed. **Ohm's law, it plays the role of changing the voltage of the two hidden ends of the electrical appliances connected in series.

Because the local resistance of the sliding rheostat will change, according to the voltage divider ratio of the series circuit, the larger the resistance of the sliding rheostat, the greater the voltage obtained by the tung tung resistant, and the smaller the voltage obtained by the tung grip electrical appliance.

1. The sliding rheostat is connected in series with a fixed value resistor at both ends of the power supply with constant voltage. When the sliding rheostat slider moves, the resistance value of its own access circuit changes, resulting in a change in the total resistance of the circuit, which can be known from Ozen's law, the total voltage does not change, and the total resistance changes, which will inevitably lead to a change in the total current in the circuit.

2. Then apply Ohmher's law to the fixed value resistance: the resistance value of the fixed value resistance does not change, and the current through it changes, so that the voltage at both ends of the fixed value resistance will inevitably change. In this way, the sliding rheostat achieves the effect of changing the voltage at both ends of the fixed value resistor.

3. The sliding rheostat is a circuit element, which can change its own resistance, so as to play the role of controlling the imperial circuit. In circuit analysis, a sliding rheostat can be used either as a fixed-value resistor or as a variable-value resistor.

The sliding rheostat is an important element in the circuit, which can change its resistance by moving the position of the sliding blade, so as to play the role of controlling the circuit. A sliding rheostat is connected in series with a constant resistor at both ends of a constant voltage power supply. When the sliding rheostat slider moves, the resistance value of its own access circuit changes, resulting in a change in the total resistance of the circuit, which can be seen from Ohm's law, the total voltage does not change, the total resistance changes, and the total current will inevitably change.

The function of the slide balance dynamic rheostat is as follows: 1. The current in the circuit can be changed by changing the resistance of the access circuit part, so as to change the voltage at both ends of the conductor (electrical appliance) connected in series. When connecting a sliding rheostat, it is required:

One up and down, the focus is on the bottom", the gold bai rod and the resistance wire each use a terminal as a column; The actual connection should be selected according to the requirements of the two binding posts of the resistance wire.

2. Pray for the function of the protection circuit, that is, connect the circuit, and before the switch is closed, the sliding blade P of the sliding rheostat should be adjusted to maximize the resistance of the sliding rheostat connected to the circuit part.

3. The voltage can be changed. Ohm's law, which plays a role in changing the voltage at both ends of the electrical appliance in series with it.

1.How it works

Because of the sliding rheostat.

It can change the resistance of the connected circuit, and when there is a current passing through the sliding rheostat, the Ohm's law of the part of the circuit.

The formula U=IR shows that the change of resistance R will cause the change of voltage U; From the Ohm's law formula of the whole circuit i= r+r), it can be seen that the change of the current i will be caused by the change of the first hole of the resistor r bridge, and it can be seen from =u+ir that when i changes, the voltage u will change, in addition, the active contact of the sliding rheostat can contact with different potential points, so the sliding rheostat can change the electrosensitive dead voltage. As shown in the figure below, if P moves to terminal A, the voltage at both ends of the load increases, and if P moves to terminal B.

move, the voltage at both ends of the load decreases.

2.Analysis of the working principle of three different circuit connection situations Series and parallel circuits.

, the resistance of the sliding rheostat changes, and the voltage division in series and the shunt principle in parallel: series circuit.

The ratio of voltage is equal to the ratio of resistance. (Because the currents are equal everywhere).

In parallel circuits, the ratio of current is equal to the inverse ratio of resistance.

Because the voltages at both ends are equal). Therefore, when the resistance of the sliding rheostat (connected to the circuit) changes, the voltage or current changes. In the experiment, the resistance of the fixed-value resistor is certain (the characteristic of the fixed-value resistance), and what changes is the voltage or current at both ends of it.

The change in the resistance of the sliding rheostat will affect the voltage and current distribution of the entire circuit, but it is conditional.

Summary. Can a sliding rheostat change current and voltage? If so, why is it possible to display a near-supply voltage on the voltmeter connected to the slip rheostat?

Hello dear! The sliding rheostat can only change the resistance and current, but can not change the voltage, the sliding rheostat cannot change the voltage, it only changes the resistance value, which is reflected in the circuit is that the resistance value becomes larger, the current through the rheostat becomes smaller, and the voltage (potential) at both ends of the rheostat increases. In addition, the sliding blade can not change the voltage, in fact, what you see is only a appearance, the rheostat can not change the voltage, only the current is changed in the circuit.

Hope it helps! If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood!

Can a sliding rheostat change current and voltage? If so, why is it possible to display a near-supply voltage on the voltmeter connected to the slip rheostat?

Can a sliding rheostat change current and voltage? If so, why is it possible to display a near-supply voltage on the voltmeter connected to the slip rheostat? Hello dear!

The sliding rheostat can only change the resistance and current, but can not change the voltage, the sliding rheostat cannot change the voltage, it only changes the resistance value, which is reflected in the circuit is that the resistance value becomes larger, the current through the rheostat becomes smaller, and the voltage (potential) at both ends of the rheostat increases. In addition, the sliding blade can not change the voltage, in fact, what you see is only a appearance, the rheostat can not change the voltage, only the current is changed in the circuit. Hope it helps!

If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood!

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<> trouble to ask you another question, if the circuit is checked correctly, the closing switch finds that there is almost no indication of the ammeter, the number of voltage representations is close to the power supply voltage, and the number of electrical representations of the moving slide plate has not changed, why is the circuit fault possible that the fixed value resistor is broken? Trouble answer, thank you

Hello dear! The resistance R is broken, the current can also flow through the voltmeter, because the internal resistance of the voltmeter is very large, so the loop current is very small, close to 0, so the ammeter has no indication, and the power supply voltage is almost all added at both ends of the voltmeter, so the voltage indication is close to the power supply voltage. . . You can think of the voltmeter as a resistor with a large resistance that can measure the voltage, and it is easy to understand, I hope it can help you!

If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood!

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