How to calculate the power of electric field force
The above is a variant of Ohm's law
the calculation of power is p = u * I
P power
u voltage
I current
P = 2.4V * 0.12A = 0.288w = 288mw
pay attention to the unit calculation of the same order of magnitude in formula calculation
expansion data:
physics terms, The work done by an electric current per unit time is called electrical power. It is a physical quantity used to express the speed of electric energy consumption. It is expressed by P, and its unit is watt; W & quot;, The symbol is w
as a physical quantity indicating the speed of current work, the power value of an electric appliance is equal to the electric energy consumed in one second. If in & quot; t" The electric energy "W" (SI unit is j) consumed in such a long time is p = w / T (defined formula). The electric power is equal to the proct of the voltage at both ends of the conctor and the current passing through the conctor
P (electric power) U (voltage) I (current) w (electric work) r (resistance) t (time)
the current is equal everywhere I1 = I2 = I total (the current is equal everywhere and equal to the total current)
the total voltage is equal to the sum of the voltages at both ends of each electrical appliance, u total = U1 + U2 (the total voltage is equal to the sum of the electric voltages of each part)
the total resistance is equal to the sum of the resistances, R total = R1 + R2
the total electric work is equal to each electric work The principle of voltage division U1: U2 = R1: R2 = P1: P2
proportion relationship of series circuit
W1: W2 = R1: R2 = U1: U2 = P1: P2 = Q1: Q2
total power equals to the sum of all powers P total = P1 + P2..... + PX or u ^ 2 / R1 + R2..... + RX
relationship between current and electric power and voltage: I = P / U
rated power ratio actual power equals the ratio of rated voltage to actual voltage Square PE / PS = (UE / US)
P=W/t =UI
In pure resistance circuit:P = I ^ 2 * r = (u ^ 2) / R
in dynamics:
1, P = w / T (average power)
2, P = FV
3, P = fvcos α Instantaneous power)
extended data
energy conversion can do work, and power is also the rate of doing work. When a person climbs a staircase with a heavy object, no matter whether he is walking up the staircase slowly or running up the staircase quickly, the work done on the heavy object is equal. However, if the power is considered, the work done on the object by running up the staircase quickly will be the same in a short time, so the power is greater
the output power of the motor is the proct of the torque proced by the motor and the angular speed of the motor, while the forward power of the vehicle is the proct of the traction on the wheel and the speed of the vehicle
power means
power is the physical quantity of how fast an object does work. In physics, power P = work J / time t, and the unit is watt. We often see power units in the media, such as kW, PS, HP, BHP, whpmw, etc
there is also the CV used in Italy before, where the side kilowatt is the international standard unit, 1kW = 1000W, and the power is 1kW when 1000 joules of work is done in one second. In our daily life, we often call power horsepower, the unit is horse, just as we call torque
in the automotive field, the largest power machine is the engine. The power of the engine is calculated by the torque, and the calculation formula is quite simple: power (W) = 2 π× Torque (nm) × Speed (RPM) / 60, after simplified calculation: power (W) = torque (nm) × Speed (RPM) / 9.549
1. There are two sources of electric field. One is generated by electrostatic charge, which is called electrostatic field. In middle school, it usually refers to electrostatic field; The second is the change of magnetic field, which is only a brief introction in Maxwell's electromagnetic field theory in middle school
2. The physical quantities describing the electric field are: field strength and potential (potential difference)
3. Understanding the electric field, knowing how the electric field is generated, and the powerful effect of the electric field on the charges in the field - introcing the concept of field strength; Second, voltage:
1. The potential difference between a and B is called the voltage of these two points
2. In a circuit, the potential across the conctor along the current direction is reced, and the potential difference between two points is the voltage between the two points, also known as the voltage at both ends of the conctor. According to the well-known Ohm's Law: u = IR
Third, current:
1. Current is the directional movement of charge, and the direction of directional movement of positive charge is the positive direction of current, so the reverse direction of negative charge point's movement is the positive direction of current< The calculation formula of current is I = q / T
Fourth, the electric power moves the charge in the electric field. If it does not move on the equipotential surface, the electric field force does work on the charge, w = Qu = (it) * u = (UI) * t = Pt = = & gt; Electric power P = UI
according to the functional relationship of "work is the measure of energy conversion", the current passing through the conctor is the process of converting the electric energy corresponding to the current into non electric energy, and the electric power represents the speed of electric energy conversion - the measure of electric energy conversion into non electric energy per unit time. This non electric energy is internal energy for pure resistance electrical appliances. In middle school, it is mostly pure resistance circuit.
It's against the law
cash out, short for cash withdrawal, generally refers to obtaining cash benefits by illegal or false means. It is mainly used for credit card cash, provident fund cash, securities cash, etc. According to the interpretation of several issues concerning the specific application of law in criminal cases of impairing credit card management issued by the two high tech institutions, cash out refers to the direct payment of cash to credit card holders by means of fictitious transactions, false prices, cash returns, etc. in violation of national regulations, using POS machines and other methods. In the "merchant risk management rules of UnionPay card acquiring institutions" of China UnionPay, the definition of cash out behavior is: the merchant colludes with bad cardholders or other third parties, or the merchant itself withdraws cash through virtual transaction
if the illegal cash out reaches a certain amount, it will constitute the crime of illegal operation
legal basis:
1 , in December 2009, the Supreme People's court and the Supreme People's Procuratorate issued the interpretation on Several Issues concerning the specific application of law in criminal cases impairing the management of credit card, which stipulates that "in violation of national regulations, using POS machines and other methods to make up transactions, falsely open prices, and If the circumstances are serious, he shall be convicted and punished for the crime of illegal business operation in accordance with the provisions of Article 225 of the criminal law. " According to the prosecutor handling the case, the so-called serious circumstances mean that the amount of cash out is more than 1 million yuan, or the funds of financial institutions are more than 200000 yuan overe, or the economic losses of financial institutions are more than 100000 yuan. If the amount of cash out exceeds 5 million yuan, or causes the funds of a financial institution to exceed 1 million yuan to be returned within the time limit, or causes the economic losses of a financial institution to exceed 500000 yuan, it shall be deemed as "the circumstances are especially serious" and shall be sentenced to fixed-term imprisonment of not less than five years
2 , Article 225 of the criminal law [crime of illegal business operation] Whoever, in violation of state regulations, commits one of the following illegal business operations and disturbs the market order, if the circumstances are serious, shall be sentenced to fixed-term imprisonment of not more than five years or criminal detention and shall also, or shall only, be fined not less than one time but not more than five times the illegal income; If the circumstances are especially serious, the offender shall be sentenced to fixed-term imprisonment of not less than five years, and shall also be fined not less than one time but not more than five times the illegal gains or be sentenced to confiscation of property:
(1) operating without permission the exclusive or monopoly commodities or other restricted commodities as prescribed by laws or administrative regulations (3) illegal operation of securities, futures and insurance business without the approval of the relevant competent departments of the state, or illegal operation of fund payment and settlement business. (4) other illegal operations that seriously disrupt the market order
Pump shaft power = 1.732 × electric current × Voltage × Power factor (0.85 for three-phase electricity and 0.75 for two-phase electricity)
according to the above formula, if you know the power and voltage, you can calculate the current
P (active power) = u (effective value of voltage) * I (effective value of current) * cosa, where a is the phase angle between voltage and current
Q (reactive power) = u (voltage RMS) * I (current RMS) * Sina, where a is the phase angle between voltage and current
active power is also called average power. The instantaneous power of alternating current is not a constant value. The average value of power in a cycle is called active power. It refers to the power consumed in the resistance part of the circuit. For the motor, it refers to its output, expressed by the letter P, and the unit is kW
reactive power: in the circuit with inctance (or capacitance), the inctance (or capacitance) changes the energy of the power supply into the energy of the magnetic field (or electric field) for storage in the half cycle time, and returns the stored energy of the magnetic field (or electric field) to the power supply in the other half cycle time. They just exchange energy with the power supply, and they don't really consume energy. We call the amplitude value of the energy exchanged with the power source reactive power, expressed by the letter Q, in kvar
apparent power: in a circuit with resistance and reactance, the proct of voltage and current is called apparent power, which is expressed by the letter S or the symbol
PS, and the unit is kilovolt ampere (kVA)
2. Mass flow controller (abbreviated as MFC)
3. Multiple frequency control