Find the formulas of physical electricity and mechanics, the physical formulas of electricity

Too much. You want to be specific, I can give it to you.

Electrical physics formula: f=kq1q2 r. Electricity is one of the sub-disciplines of physics.

His research focuses on the formation of "electricity" and its applications. In the West, the word "electricity" in Dongzhou is derived from the Greek word amber, and in China it is derived from the lightning phenomenon.

Physics is the study of the most general laws of the motion of matter and the basic structure of matter. As a leading discipline of self-knowledge, the study of physics refers to the dissolution of tremors from the universe to elementary particles.

and the most basic forms and laws of motion of all matter, so they have become the basis for the study of other natural science disciplines.

1. i=u/r(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 of the conductor).

2. i=i1=i2=…=in (series circuit.

The characteristics of the medium current: the current is equal everywhere).

3. u=u1+u2+…+un (characteristics of voltage in series circuits: in series circuits, the total voltage is equal to the sum of the voltages at both ends of each part of the circuit).

4. i=i1+i2+…Socks + IN (parallel circuit.

Characteristics of medium current: the current on the main circuit is equal to the sum of the currents of each branch).

5. u=u1=u2=…=un (Characteristics of voltage in parallel circuits: The voltage at both ends of each branch is equal. The bridge is equal to the mains voltage).

6. r=r1+r2+…+rn (characteristic of resistance in series circuits: the total resistance is equal to the sum of the resistances of the parts of the circuit).

7. 1/r=1/r1+1/r2+…+1 rn (Characteristic of resistors in parallel circuits: The reciprocal of the total resistance is equal to each parallel resistor.

of the reciprocal).

8.r and = r n (the formula for finding the total resistance when n of the same resistor in parallel).

9.r string = nr (the formula for finding the total resistance when n of the same resistor in series).

The physical electrical formula is as follows:1. The current on the trunk road is equal to the sum of the currents of each branch: i=i1+i2+....＋in。

2. The total resistance is equal to the sum of the resistance of each part of the circuit: r=r1+r2+....＋rn。

3. In the series circuit, the total voltage is equal to the sum of the voltages at both ends of each part of the circuit: u=u1+u2+....＋un。

4. Calculate electrical work: w=i2rt; w=pt；w=uq (q is the amount of electricity).

5. Electric power formula: p=i2r and p=u2 r.

6. The ratio of currents is equal to the inverse ratio of their corresponding resistance: i1:i2=r2:r1.

7. Joule's law: Q=I2RT.

8. In series circuits, the ratio of electric power is equal to the ratio of voltage and resistance corresponding to them: p1:p2=u1:u2=r1:r2.

9. W=Q, where W is the work done by the current flowing through the conductor, and Q is the heat generated by the current flowing through the conductor.

10. The reciprocal of the total resistance is equal to the sum of the reciprocal of each parallel resistance: 1 r=1 r1+1 r2+....＋1/rn。

The physical electrical formula is as follows:1. Current intensity: i=q power t.

2. Resistance: r= pl s.

3. Ohm's law: i=u r.

4. Joule's Law:

1) Q = Gong 2RT (universal formula).

2) Q = UIT = PT = UQ Electricity = U2t R (pure resistance formula).

5. Series circuit:

1）i=i1=i2。

2）u=u1+u2。

3）r=r1+r2。

4) w=uit=pt=uq (universal formula).

5) W=I2RT=U2T R (pure resistance formula).

6) u1 u2=r1 r2 (partial pressure formula).

7）p1/p2=r1/r2。

Introduction to Physics:Physics is the study of the most general laws of motion of matter and the basic structure of matter. As a leading discipline of natural science, physics studies the most basic forms and laws of motion of all matter, from the universe to elementary particles, so it has become the research foundation of other natural science disciplines.

Physics began in the days of Galileo and Newton, and it has become a fundamental science with many branches. Physics is an experimental science, and it is also a science that advocates rationality and attaches importance to logical reasoning. Physics makes full use of mathematics as its working language, and it is one of the most sophisticated natural sciences today.

Electricity is the study of electrical phenomena such as electric charge, electric current, electric field, electric potential, and charge motion. There are many important formulas in electricity, which are widely used in the manufacture and grinding of various circuit designs and electronic devices. There are several electrical formulas listed in the lower liquid banquet doumen:

1.Ohm's law: U=IR, which indicates the relationship between the magnitude of the resistance and the current passing through it.

2.Kirchhoff's Law: This law includes Kirchhoff's current law and Kirchhoff's voltage law, which is used to solve complex circuit problems.

3.Faraday's Law of Electromagnetic Induction: Indicates that a change in the magnetic field causes an induced electromotive force, and its formula is: =d dt, where denotes the induced electromotive force, which denotes the magnetic flux.

4.The formula for magnetic flux density: b = a, which represents the distribution of magnetic flux per unit area, where b represents the magnetic flux density, which represents the magnetic flux, and a represents the area.

The above formulas are only a part of electricity, there are more formulas and equations in different application fields, electrical formulas are an important part of the foundation of electricity, learning and mastering these formulas is the basis for understanding and solving various electrical problems.

The electrical formula is as follows:

Coulomb's law: f kq1q2 r

Electric field strength: e f q (defined, calculated vacuum point (source).

The electric field formed by the charge e kq r

The field strength of a uniform electric field e uab d

Electric field force f qe

Potential to potential difference: UAB a-b, uab wab q - δeab q

Electric field force work: wab quab eqd

Electric potential energy: ea q a

The change in electric potential energy δ eab eb-ea

Junior high school physics is the basic subject of compulsory education, and this course is generally offered from the second year of junior high school, and the teaching time is two years. Generally, it is also a compulsory subject for the high school entrance examination.

The main purpose of learning physics knowledge is to use physics knowledge to explain various phenomena in life, and use physics knowledge to analyze the causes of various problems, so as to find out the methods and measures to solve related problems.

The difference between concave and convex lenses.

One. The structure is different.

A convex lens is composed of a transparent mirror body ground into a convex spherical surface on both sides (the tips are thick at both ends).

The concave lens is composed of a transparent mirror body that is ground into a concave spherical surface on both sides (thick at both ends and thin in the middle).

Two. The effect on light is different.

Convex lenses mainly act as converging light rays.

Concave lenses mainly play a divergent role in light rays.

Three. The nature of the imaging is different.

The convex lens is refractive and imaged, and the image can be forward or backward; imaginary, real; Release, shrinkage. Plays a spotlight role.

A concave lens is a refractive image that can only be imaged into a reduced upright image. Astigmatism lenses (including convex lenses) are instruments that transmit light rays through and use the light rays to be refracted for imaging, and the light rays obey the laws of refraction.

The convex lens can be used as an inverted magnification, an equal-size, reduced real image, or an upright magnified virtual image. Directional light can be concentrated in the focal point, and the light emitted by the focal point can also be refracted into directional light.

The convex mirror can only be used to form an upright and reduced virtual image, and is mainly used to expand the field of view.

Suggestion: Just memorize the most basic physical formulas, and then use the basic deduction to go through the complex formulas, so that even if you forget them, you can deduce them immediately!

1.Resistance: r= l s

2.Ohm's Law: i u r

3.Series circuit: r r1 r2

4.Parallel circuit: 1 r 1 r1 1 hu dongchang r2r r1r2 (r1 r2)].

p＝i2^r＝u^2/r

Pure resistance formula).

Q i2RT Universal Formula).

q uit pt uq power u2t r

Pure resistance formula).

w＝uit＝pt＝uq

Universal formula) w i 2rt u 2t r

Pure resistance formula).

1. Current intensity: i=q power t.

2 Resistance: r = l s

3. Ohm's law: i=u r.

4. Joule's Law:

Q i2RT Universal Formula).

Q Tremor Signal UIT pt UQ Charge U2t R Pure Resistance Formula).

5. Series circuit:

i＝i1＝i2

u＝u1＋u2

r＝r1＋r2

u1/u2＝r1/r2

Partial pressure formula) p1 p2 r1 r2

6 parallel circuits:

i＝i1＋i2

u＝u1＝u2

1/r＝1/r1＋1/r2

r＝r1r2/(r1＋r2)]

i1 i2 r2 r1 (shunt formula).

p1/p2＝r2/r1

7. Constant Resistance:

i1/i2＝u1/u2

p1/p2＝i12/i22

p1/p2＝u12/u22

8. Electric power: w uit pt uq

Universal formula) w i 2rt u 2t r

Pure resistance formula).

9. Electric power: P W T UI

Universal formula) p i2 r u 2 r

Pure resistance formula).

p=u2i for pure resistive parallel circuits).

Joule's law: q=w) when the circuit is a purely resistive circuit).

Home circuit trunk current: i=

p u look at the nameplate to find the current of the normal operation of the electrical appliance: i = p u look at the nameplate to find the resistance:

r=u2/p

Series circuit: i=i1=i2

u=u1+u2

r=r1+r2(r=nr0)

Parallel circuit: i=i1+i2

u=u1=u2

Pure parallel circuit).

Common (for simultaneous series or parallel circuits): w=w1+w2p=p1+p2