Is voltage directly related to resistance?

Analysis: The content of Ohm's law: The current passing through a conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor.

Formula: i u r

When the voltage at both ends of the conductor is constant, the current in the conductor is inversely proportional to the resistance of the conductor.

When the resistance of the conductor is constant, the current in the conductor is proportional to the voltage across the conductor.

Normally, the resistance of the same conductor is constant, it does not change with changes in voltage or current. The magnitude of the voltage applied to the conductor determines the amount of current passing through the conductor.

r=u i.

The resistance r can be calculated using u i, which does not determine the magnitude of the resistor

Resistance is a property of the conductor itself, and it is a physical quantity that indicates the magnitude of the conductor's action on the current resistance. It has nothing to do with the voltage at both ends of the conductor and the current through the conductor.

Factors that determine the magnitude of resistance: The resistance of a conductor is related to its length, cross-sectional area, material of the conductor, and the temperature of the conductor.

U=RI voltage is provided by the power supply!

When the current in the conductor is constant, the voltage across the conductor is proportional to the resistance of the conductor.

r=u i or u=ri is just a calculation!

Normally, the resistance of the same object or element is constant, it does not change with changes in voltage or current. The amount of voltage applied across the component determines the amount of current through the element.

The current is variable, while the resistance is an electronic device, and the general resistance is immutable (except for the influence of temperature and other factors), and the voltage is also generally immutable.

Resistance is a property of matter.

Voltage and current are represented by the resistance only by its ratio.

Don't pay too much attention to the teacher's words, this question is very simple, use your brain, think about it, you will understand.

In fact, these three formulas are the same, and they all reflect a relationship.

Take the second formula, for example. At a certain time, the two resistors are larger than the size, of course, the greater the voltage, the greater the resistance.

But again, the second formula, the voltage increases, and the resistance does not change. Because the current will also increase.

In short, read the questions carefully, forget the teacher's words, use your brain, and summarize your experience.

The mathematical relationship between voltage and resistance is: r=u i. (Resistance = Voltage Current).

In the same circuit, the current through a conductor is proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. This law was proposed by the German physicist Georg Simon Ohm in his book "Determination of the Law of Conductivity of Metals" published in April 1826.

Resistance indicates the magnitude of a conductor's action on the current resistance. In the case of a certain temperature, the magnitude of the conductor resistance is determined by the material, length, and cross-sectional area of the conductor itself. It has nothing to do with whether the circuit is connected, the applied voltage, and the size of the current through it.

Impedance is the ratio of voltage to current, and the voltage is measured with a millivoltmeter, and it is not easy to measure the electrical turbulence. In the circuit, a standard resistor with a small resistance value is connected in series as a current sampling resistor, and the voltage on the resistor is measured, and then the current defeat hood value is calculated.

As long as the resistance value of the sampling resistance is much smaller than the impedance value of the measured element, the measurement accuracy is ***. It cannot be replaced by a small inductance or a large electric judgment.

Characteristics of series circuits.

1. The current in the series circuit is equal everywhere: i=i1=i2

2. The total resistance in the series circuit is equal to the sum of the resistances: r=r1+r2

3. The total voltage in the series circuit is equal to the sum of the voltages at both ends of each resistor: u=u1+u2

4. The ratio of the voltage at both ends of each resistor in the series circuit is equal to the ratio of the resistance: u r=u1 r1=u2 r2

5. The ratio of the power of each resistor in the series circuit is equal to the ratio of the resistance: p r=p1 r1=p2 r2

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 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.