What is the relationship between current and voltage in a superconducting circuit? Ohm s law probabl

Ohm's law still applies.

Suppose there is a current in a superconductor, no matter how large the current is, then the voltage across the conductor is always zero, which does not contradict Ohm's law (U=IR). So you don't have to think about adding a voltage to both ends of the superconductor and the current will be infinite, because you can't add this voltage at all.

To generate an electric current in a superconductor, other equipment is required, such as directing the current through a wire to the superconductor, so that the current is not infinity due to the internal resistance of the wire and the power supply. You can also add a changing magnetic field to the superconducting coil to generate an electric current, because the rate of change of the magnetic field cannot be infinite, and the self-inductance of the coil will produce a back electromotive force, so the current will not reach infinity.

Therefore, it is important to note that for superconductors alone, the voltage at both ends is always zero. (Voltage is not necessary to generate current).

In addition to making wires, superconductors can also be made into inductive components, which will greatly improve the performance of inductors. Because especially when there are many turns of the ** coil, such as the motor, the coil itself will have a large resistance, and this resistance is something we do not want to have (it will lose unnecessary energy), if you use a superconductor to make this coil, you can solve this problem.

Superconductors can be used as coil-type components, and they have good performance.

Summary. Hello, not applicable.

1. Ohm's law is i=u r

The resistance of a superconductor is zero, and it doesn't make sense to do a divisor with zero, so r of Ohm's law cannot be zero.

2. Ohm's law applies to all circuits with superconductors (including battery internal resistance).

i=u/（r+r）

r=0i=u/r

Does Ohm's law apply to electric currents in superconductors?

Hello, not applicable. 1. Ohm's law is i=u r The resistance of superconductors is zero, and zero is not a divisor with the significance of being blind, so the r of Oum's law cannot be zero. 2. Ohm's law applies to all circuits with superconductors (including battery internal resistance).

i=u/（r+r）r=0i=u/r

Can the resistance of the formula U=IR be O in circuit analysis?

Yes, ideally 0 thanks!

The current is proportional to the voltage. Ohmding's tung rolling law refers to the fact that in the same circuit, the current through a certain section of conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of this 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.

When Ohm's law is established, the curve made by taking the voltage at both ends of the conductor as the abscissa and the current i in the conductor as the ordinate is called the volt-ampere characteristic curve. This is a straight line through the origin of the coordinates, and its slope is the reciprocal of the resistance. Electrical components with this property are called linear elements, and their resistance is called linear resistance or ohmic resistance.

When Ohm's law does not hold, the volt-ampere characteristic curve is not a straight line passing the origin, but a curve of different shapes. Electrical components with this property are called nonlinear components.

Ohm's law states that in the same circuit, the current passing through a conductor is proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. As the work on circuits progressed, the importance of Ohm's law was gradually recognized, and Ohm's reputation increased greatly. In honor of Ohm's contribution to electromagnetism, the physics community named the unit of resistance Ohm, which is represented by symbols.

Of course, it is also applicable, the so-called superconductor is that some conductors have almost zero resistance under special environments and conditions, so the voltage drop after conduction is also close to zero.

Any truth has a limit of application, and the formation mechanism of superconductivity and ordinary conductor currents is completely different, and it is certainly not applicable.

Superconductors are naturally inapplicable because they have no resistance.

I don't think it should be applicable, because Ohm's law has current and resistance in it, superconductors have no resistance, and when you put resistance above the denominator, it doesn't make sense.

Ohm's Law. The relationship between the resistance of the conductor, the voltage at both ends of the conductor, and the current flowing through the conductor The resistance value of the conductor is determined by the nature of the conductor itself, and has nothing to do with the voltage at both ends of the conductor and the current flowing through the conductor Therefore, D is selected

This is Ohm's law for partial DC circuits, but Ohm's law for full circuits includes the electromotive force of the power supply and the internal resistance of the power supply, while Ohm's law for AC circuits includes capacitance and inductance (resistors, capacitors, and inductors are collectively called impedance).

Well, one of the three must be quantitative, in order to compare the relationship between the other two, that is, the current in the conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor. I've listed the formula for you.

i=u/r)

The resistance is constant, the greater the voltage at both ends of the conductor, the greater the current through the conductor, which is proportional; When the voltage at both ends of the conductor is constant, the greater the resistance of the conductor, the smaller the current through the conductor, which is the inverse relationship between them. I would like to add that the inverse theorem (r=u i) introduced by Ohm's law is correct, but you must not say that the size of the resistance of the conductor is proportional to the voltage, the current is constant, and the greater the voltage at both ends of the conductor, the greater the resistance, which is wrong.

Who says you can't say it? That's exactly what you can say. Ohm's law can be formulated as:

1.Resistance is equal to the ratio of the voltage across the resistance to the current flowing through the resistance;

2.The current flowing through the resistance is proportional to the voltage at both ends of the resistance and inversely proportional to the resistance value;

3.The voltage at both ends of the resistance is proportional to the value of the resistance and proportional to the current flowing through the resistance;

There are many ways to express the same content. It's like giving a girl to express her thoughts, there are too many ways to express it, but the content is the same. I see? This is the flexibility of language, and an equation itself is a technical language, and it is no exception.

Divided, I care more about this.

In a circuit, when the resistance is constant, the current is proportional to the voltage.

No, the amount of current does not affect the change of voltage, the voltage is a fixed amount Unless the amount of voltage is related to the current Voltage is proportional to the current.

For example, can you say that the father looks like a son, and who looks like his father.

Actually, the above narrative is two sentences, which should be:

Sentence 1: The current in the conductor is proportional to the voltage at both ends of the conductor.

If the conductor is certain, then r is certain, and according to r=u i, i is proportional to u. It can be seen that the control variable, that is, r is a fixed value.

Second sentence: The current in the conductor is inversely proportional to the resistance.

If the voltage is constant, then you must be certain, and according to i=u r, i is inversely proportional to r. It can be seen from this that the control variable, that is, u is a fixed value.

Because of the laws in physics, the language requires conciseness, so the merging of two sentences into one sentence eliminates some detailed conditions.

i=u r, so i 1 r, i u. Because it can list proportional formulas, it is correct in multiple-choice questions (this reasoning is conventional, so there is no need to dwell on it). In addition, resistance is a property of the conductor itself, so it cannot be said that resistance is directly or inversely proportional to voltage or current.

The magnitude of the resistance depends on its length, temperature, and cross-section.

Answer: Ohm's law.

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

** "Relationship between current and voltage and resistance in a conductor", obtained:

Relationship 1: When the resistance is constant, the current is proportional to the voltage;

Relation 2: When the voltage is constant, the current is inversely proportional to the resistance

Therefore, the answer is: the current in the conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor; When the resistance is constant, the current is proportional to the voltage; At a certain voltage, the current is inversely proportional to the resistance

Experiment 17 ** Relationship between current and voltage and resistance.