Why do resistors such as sliding rheostats change voltage? Does he have the effect of altering the c

Resistors, such as sliding rheostats, are connected to the circuit and distribute a portion of the voltage over themselves. By adjusting the resistor, the shared part of the voltage can be changed.

By changing the voltage. Causes a change in the current in the circuit.

If the circuit is fine. It will change the voltage, and of course it will change the current.

There is an experiment by adjusting the resistor. to measure the current.

If you don't understand, you can ask.

By changing the length of the resistance wire of the access circuit, the total resistance of the circuit is changed, and the current in the circuit is changed. The current in the series circuit is equal, so the greater the resistance of the electrical appliance, the greater the voltage divider at both ends i=u r (the resistor is the electrical appliance). Your question is not very clear.

The role of sliding rheostat in the circuit: voltage division, current limiting, and protection.

The essence of voltage division is: the current of the series circuit is equal, and the voltage is proportional to the resistance;

The essence of current limiting is: under the condition that the voltage is unchanged, the current can be changed by changing the resistance.

On a series circuit, the resistance ratio is the voltage ratio.

A sliding rheostat can be seen as two resistors connected in series from the slide block to point seven, and changing the position of the slider changes the ratio of the two resistors.

The magnitude of the current cannot be changed because the resistance of the external circuit is .

There are pull-up resistors and pull-down resistors, which are achieved by electric potential, and the resistors certainly have the effect of changing the current. In the project, it is generally limited in current.

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.

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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!

Thank you for your <>

<> 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!

Crab crab crab crab <>

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, 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.

Summary. This is because the function of a sliding rheostat is to ensure that the voltage across the resistor remains constant.

When studying the relationship between current and resistance, why is the function of a sliding rheostat to keep the voltage constant? Is there a relationship between resistance and voltage?

This is because the function of a sliding rheostat is to ensure that the voltage across the resistor remains constant.

The formula for current and voltage is U=IR voltage (U) voltage, also known as potential difference or potential difference, which is a physical quantity that measures the energy difference between a unit charge in an electrostatic field due to different electric potentials. Its magnitude is equal to the work done by a unit positive charge to move from point A to point B due to the action of an electric field force, and the direction of the voltage is specified as the direction from the high potential to the low potential.

The relationship between resistance and voltage: Euclidean's law.

The resistance of a fixed-value resistor cannot be changed. The characteristics of the resistive element itself are only related to the resistive element itself.

Resistors can bear voltage, but they cannot generate voltage. The voltage is generated by the power supply. A closed circuit consisting of a power supply, a resistive element, and a wire generates an electric current.

When an electric current is passed through a resistive element, the resistive element has a voltage. It can also be said that the voltage of the resistance is determined by the current because the current flows through the resistor, so the voltage of a fixed value resistor is determined by the current.

Like you said, sliding variable resistance crying, changing the voltage by changing the resistance value, this sentence is true. When the sliding rheostat cry is connected in series with the power supply, the resistance value is changed, and the voltage is also unchanged. u=ir。

As can be seen from this formula, when the resistance value changes, the current also changes, and the change in voltage cannot be determined. And what you said, when the current changes, the voltage changes, the premise of this sentence is that the resistance does not change.

I don't know if you understand what I'm saying. Voltage and resistance are two different concepts. Two natures.

Two physical quantities. There is a relationship between these two physical quantities, but it is not a decisive relationship. The determinant of any physical quantity is its own property.

They cannot be misled by the formula connections between them.

Voltage = Resistance * Current.

Current = Voltage Resistance.

Resistance = voltage and current.

Note that a common mistake made in this formula is the phrase "resistance follows conduction."

The voltage of the two segments of the body is directly proportional to the current", this statement is wrong, the resistance is the inherent property of the conductor itself, only with the material, temperature (in middle school.

Exposure to these) is not related to voltage and current, and this question is often selected.

Resistance is a property of a substance, and the resistance of different materials is not the same, and it has nothing to do with voltage.