What is Ohm s law and what is Ohm s law

In the same circuit, the current in the conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance value of the conductor, which is Ohm's law, and the basic formula is i=u r. Ohm's law was proposed by George Simon Ohm, and in honor of his contribution to electromagnetism, the physics community named the unit of resistance Ohm, which is represented by symbols.

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.

Formula: i=u r in the formula: i ampere (a); u volts (v); r Euro ( ).

Understanding of the formula: The i, you and r in the formula must be in the same circuit segment; Any two quantities known in i, u, and r can be found for another quantity; The units should be uniform when calculating.

Application of Ohm's Law:

The resistance of the same resistor does not change, independent of current and voltage, and its current increases with the increase of voltage. (r=u/i)

When the voltage is constant, the greater the resistance, the smaller the current passing through. (i=u/r)

When the current is constant, the greater the resistance, the greater the voltage across the resistor. (u=ir)

The series connection of resistors has the following characteristics: (refers to R1, R2 series series, the more strings, the greater the resistance).

Current: i=i1=i2 (the current is equal everywhere in the series circuit).

Voltage: U=U1+U2 (the total voltage is equal to the sum of the voltages everywhere).

Resistance: r=r1+r2 (total resistance is equal to the sum of each resistance) If n equivalent resistors are connected in series, then there is r total = nr

Partial pressure effect:=; Calculate u1, u2, available:;

Proportional relationship: current: i1:i2=1:1 (q is heat).

The parallel connection of resistors has the following characteristics: (refers to R1, R2 in parallel, and the more they are combined, the smaller the resistance).

Current: i=i1+i2 (the trunk current is equal to the sum of the currents of each branch).

Voltage: u=u1=u2 (the main circuit voltage is equal to the voltage of each branch).

Resistance: (The reciprocal of the total resistance is equal to the sum of the reciprocals of each resistance) If n equal resistors are connected in parallel, then there is r total = r

Diversion effect:; Compute i1, i2 available:;

Proportional relationship: voltage: u1:u2=1:1, (q is heat).

In the case of DC, the current in a closed circuit is proportional to the electromotive force, or when there is no electromotive force in a circuit element, the current is proportional to the potential difference between the two terminals.

Standard: r=u i

To put it simply, the resistance is a fixed value, the current increases when the voltage increases, and the current decreases when the voltage decreases (all on the premise that there is no motor in the circuit).

Original formula: i u r

In the same circuit, the current in the conductor is proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor, which is Ohm's law.

r=u i r is the resistance, u is the voltage, and i is the current.

What exactly is Ohm's law?

Ohm's law is an important law of electrical circuits obtained by the German physicist Ohm in the early 19th century (1827) after a large number of experiments. Ohm's Law; The current in the conductor is proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor The current in Ohm's law is the current through the conductor, the voltage refers to the voltage applied to both ends of the slip conductor, and the resistance refers to the electrical value of the conductor Ohm's law formula i=u r The i, u, and r in the formula must be for the same circuit The unit of unit closure judgment should be unified The unit of i is ampere (a) The unit of u is volt (v) The unit of r is ohm It is not easy to answer the question, Please give a good review if you are satisfied, Your recognition is my biggest motivation. I wish you a happy and > study

Ohm's Law (ohm's law) means 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. 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.

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 first phase of experiments was on the attenuation of the electromagnetic force produced by an electric current as a function of wire length, the results of which were published in his first scientific paper in May 1825.

In this experiment, he encountered difficulties in measuring the intensity of the electric current. Inspired by the galvanometer invented by the German scientist Schweiger, he combined Oster's discovery of the magnetic effect of electric current with the Coulomb torsion scale method to design a current torsion scale and use it to measure the intensity of electric current.

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Problem description: As the question, know how much to say.

Analysis: Ohm's law is of two kinds:

1.Ohm's law for partial circuits, also known as Ohm's law for external circuits, ie.

i=u/r u=r*i r=u/i

i = current. U = voltage.

r=resistance 2Ohm's law for all circuits, ie.

U (electromotive force of the power supply) = voltage of the external circuit + current * internal resistance of the power supply.

The voltage of the external circuit = the equivalent resistance of the external circuit * current.

Note: The current in these two equations is the same.

3): It should be noted:

2) Ohm's law applies to metal conductors and electrolyte solutions in the usual robust state, but not to gaseous conductors and some other conductive components (tubes, thermistors). In the case of a circuit, it is only true for a length of conductor that does not contain a power supply.

Ohm's law is a law that reflects the relationship between the voltage at both ends of a resistive element and the current passing through the element and electrons, which is called Ohm's law.

Ohm's law is expressed as i=u r

where i - current (a), u - voltage (v), r - resistance ( ) In Ohm's law, the current is proportional to the voltage across the resistor and inversely proportional to the resistance.

Brief description: In the same circuit, 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, which is Ohm's law.

Ohm's law formula for partial circuits: i=u r

Wherein: i, u, r - the three quantities are the current intensity, voltage and resistance at the same time in the same part of the circuit.

The formula is derived from Ohm's law:

Parallel circuit: series circuit.

i total = i1 + i2 i total = i1 = i2

u total = u1 = u2 u total = u1 + u2

1:r total = 1:r1+1:r2 r total = r1+r2ri1:i2=r2:r1 u1:u2=r1:r2r total = r1r2:r1+r2

r total = r1r2r3: r1r2 + r2r3 + r1r3, i.e. 1 r total = 1 r1 + 1 r2 + ......1 rni q t current charge time (minutes to seconds) that is: current, voltage, resistance.

or voltage, resistance, and current.