What symbols are used to represent current, voltage, and power

The current is expressed in i and is in a (ampere, the SI unit of electric current.

Ampere is named after his surname), abbreviated as "Ann", symbol.

a", which also refers to the directional movement of the charge in the conductor.

Voltage is expressed in U in V (volts), and in order to generate current in a circuit, there must be voltage at both ends of it. The function of the power supply is to provide voltage to both ends of the electrical appliance.

Power is expressed in p and is measured in w (watts), and power can be divided into electrical power.

force, power, etc. Therefore, the calculation formula is also different.

Extended Materials. Power refers to the amount of work done by an object per unit of time, i.e., power is a physical quantity that describes how fast or slow work is done. The amount of work is constant, and the shorter the time, the greater the power value.

The formula for finding power is power = work time. Power is a physical quantity that characterizes the degree of work done fast or slow. The work done per unit of time is called power and is denoted by p.

Therefore, the power is equal to the scalar product of the force and the velocity of the point where the object is stressed.

Current is expressed in i in a (amps), voltage is expressed in u in v (volts), and power is expressed in p in w (watts).

Current: The unit is amperes (a), and "i" is used as the code;

Voltage: The unit is volts (V), and "U" is used as the code;

Power: The unit of active power is watts (W), and "P" is used as the code;

The unit of reactive power is var, and "Q" is used as the code;

The apparent unit of power is volt-ampere (VA), and the code is indicated by "S".

Current: Indicated by "i" in amperes (a).

Voltage: Expressed using "U" in volts (V).

Power: Expressed using "P" in watts (W).

ForDirect current, power is equal to current multiplied by voltage: power (DC) = current * voltage.

For the commonly used alternating current, it is also multiplied by the power factor.

Power (single-phase AC) = voltage * current * power factor.

If you are using three-phase alternating current.

It is also multiplied by: power (three-phase AC) = voltage * current * power factor *.

Power:

Formula for calculating electrical power.

p=w/t =ui。

In a purely resistive circuit, according to Ohm's law.

U=IR can also be substituted into P=UI to get P=I2R=(U2) R.

In kinetics: power calculation formula: average power); p=fvcos (instantaneous power).

Since w=f(f force) s(s displacement) (the definition of work), the formula for finding power can also be derived from p=f·v.

p=w t=f*s t=f*v (this formula is suitable for objects moving in a uniform linear velocity).

P in the formula stands for power, the unit is "watts", abbreviated as "watts", and the symbol is w.

w denotes work. The unit is "joules", abbreviated as "joules", and the symbol is j.

t is the time, the unit is "seconds", and the symbol is s"。

Electrical power is denoted by p.

Its unit is watt, abbreviated as watt, and the symbol for watt is w. The work done by the current per unit of time is called the electrical power, taking the light bulb as an example, the higher the electrical power, the brighter the light bulb.

The brightness of the bulb is determined by the electrical power (actual power), not by the current, voltage, or electrical energy that passes! The magnitude of electrical power is not only related to the amount of work done by the current, but also related to the time taken to do the work. 1kw 1000w is a physical quantity that indicates the speed of energy consumption, and the power of an electrical appliance is equal to the amount of electrical energy it consumes in 1 second (1s).

The formula for calculating electrical power, multiplying the voltage by the current, this formula is the definition of electrical power, always correct and applicable to any situation, for purely resistive circuits.

Such as resistance wires, light bulbs, etc., can be calculated by the formula of multiplying the square of the current by the resistance, and the square of the voltage divided by the resistance, which is derived from Ohm's law.

However, for non-purely resistive circuits, such as motors, the formula of multiplying voltage by current can only be used, because Ohm's law does not apply to motors, etc., that is, voltage and current are not proportional. This is because the motor generates a back EMF when it is running.

The current symbol is i. In electromagnetism, the amount of electricity passing through any cross-section of a conductor per unit time is called current intensity, referred to as current, the current symbol is i, the unit is ampere (a), abbreviated as "ampere" (André Marie Ampère, 1775 1836, French physicist and chemist, has made outstanding achievements in the research of electromagnetic interaction, and has also contributed to mathematics and physics). The SI unit of electric current is named after its surname).

Directions

Physically, the direction of the current is specified, which is the direction of the positive charge's directional motion (i.e., the positive direction of the speed of the positive charge's directional motion or the opposite of the speed of the negative charge's directional motion). The direction of current motion is opposite to the direction of electron motion.

Charge refers to the free charge, which is free electrons in metal conductors and positive and negative ions in aqueous solutions of acids, bases, and salts.

Current flows from the positive electrode to the negative electrode outside the power supply, and from the negative electrode back to the positive electrode inside the power supply.

The above content reference: Encyclopedia - Current.

The current symbol is "a". Scientifically, the amount of electricity passing through any cross-section of a conductor per unit of time is called current intensity, referred to as current. Usually represented by the letter i, its unit is the ampere (André Marie Ampere), from 1775 to 1836, the French physicist and chemist, who made outstanding achievements in the study of electromagnetic effects, and also contributed to mathematics and physics.

The SI unit of electric current, the ampere, is named after its surname), abbreviated as "ampere", and the symbol "a", also refers to the directional movement of electric charges in a conductor.

Effect of electric current:

1.The thermal effect, in which a conductor generates heat when energized, is called the galvanic thermal effect. For example, the familiar Joule's law: it is a law that quantitatively states that conduction current converts electrical energy into heat energy. (Joule's Law).

2.Magnetic effect, the magnetic effect of electric current (kinetic electricity produces magnetism): Oster discovered that any wire that has an electric current can produce a magnetic field around it, which is called the magnetic effect of electric current. (Biot-Safar's Law).

3.Chemical effect, the chemical effect of electricity is mainly due to the chemical change of matter caused by the participation of charged particles (electrons or ions) in the electric current. Water electrolysis or electroplating in chemistry are chemical effects of electric current. (Faraday's Law of Electrolysis).

Current is a physical quantity expressed (the amount of charge passing through a certain section of a wire per unit time), which is represented by the symbol (i), and its unit is (ampere), abbreviated as (

Ann), the symbol is (a

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The basic unit of electric current is "a" (ampere, also abbreviated as "ampere");

The symbol for the current is i.

There is no specific symbol for the strength of the current. Traditionally, the current is divided into strong electricity and weak electricity, simply put, the current ratio as an energy source is relatively large, in a unit, called strong electricity; The current used for electrical signal transmission is relatively small, only in the microampere (A, millionths of a a) or milliampere (ma, thousandths of a a) range.