How to convert µA to amperes: formula and calculation procedure

When connecting heaters and other powerful consumers of electricity, it is necessary to take into account the compatibility of the power source, wiring, and circuit breakers. If you convert watts to amperes incorrectly, expensive, high-quality equipment will be damaged. This publication will help eliminate dangerous emergency situations.

Incorrect calculation can cause a fire

How is ampere broken down?

Current strength is perhaps one of the most fundamental characteristics of electric current. It is denoted by the capital letter I of the Latin alphabet and is equal to Δq divided by Δt, where Δt is the time during which charge Δq flows through the cross section of the conductor.

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Tables of ratios of amperes, volts, watts, ohms

To simplify, the main parameters of the electrical circuit are explained using the example of the functioning of a conventional pipeline. The movement of fluid is ensured by the pressure difference. The narrowing (expansion) of the transport route changes the flow resistance accordingly. If necessary, using the listed parameters or experimentally, you can set the pipeline productivity in liters per unit of time.

By analogy with the above description, the potential difference (voltage) ensures the movement of electric charges (current). As the cross-section of the conductor decreases, the electrical resistance increases. Knowing the basic parameters, it is easy to calculate the power consumption of the connected load.

Table for calculating the comfort zone of “electronic” cigarettes

The specified power data corresponds to certain resistance and voltage values. Similar tables are compiled for converting Watts into amperes and other quantities. This example clearly demonstrates the main disadvantages of the tabular form:

• complexity of processing large amounts of data;
• discreteness of information provision;
• limited accuracy.

Graphical representation of basic formulas for calculating electrical parameters

Using calculations, you can convert volts to amperes quickly and accurately.

For your information. As an alternative, an electrical quantity converter is used, which is available for free use on reference and specialized websites on the Internet.

Convert Volt Amperes to Watts, VA to kW

For calculation use the formula:

Pп (apparent power, kVA) = Pa (active power, kW)*cos ϕ.

Example:

• generator power in normal operating mode – 8 kW;
• The documentation for the connected machine indicates the power consumption:

7 kW and cos ϕ = 0.8

• When connecting such a load, the power source will not be able to provide the required operating mode:

8*0.8=6.4 kW.

What is power? Watt [W]

Watt , according to the SI system, is a unit of measurement of power. Nowadays it is used to measure the power of all electrical and other devices. According to the theory of physics, power is the rate of energy consumption, expressed in the ratio of energy to time: 1 W = 1 J/1 s. One watt is equal to the ratio of one joule (a unit of work) to one second.

Today, the unit of measurement kilowatt (abbreviated designation kW) is more often used to indicate the power of electrical appliances. It’s easy to guess how many watts are in a kilowatt - the prefix “kilo” in the SI system denotes the value obtained by multiplying by a thousand.

For calculations involving power, it is not always convenient to use the watt itself. Sometimes, when the quantities being measured are very large or very small, it is much more convenient to use a unit of measurement with standard prefixes, which avoids constant calculations of the order of the value. Thus, when designing and calculating radars and radio receivers, pW or nW are most often used; for medical devices such as EEG and ECG, μW is used. In the production of electricity, as well as in the design of railway locomotives, megawatts (MW) and gigawatts (GW) are used.

Conversion of watts to amperes for three-phase alternating voltage

Sequencing:

• To select a suitable protective device, use the following formula:

I = P/ (U * √3)

• summarize the power of connected devices:

2,300 + 2,400 +1,800 = 6,500 W

• calculate the current in the circuit at maximum load:

6,500/(380 * 1.732) = 9.876 A.

Select a suitable machine for a three-phase network. In this example, a product rated at 10 A is suitable.

Units

In Russia, the International System of Units (SI), adopted in 1960 at the General Conference on Weights and Measures, is widely used. There are only seven system-forming basic physical quantities in the SI system:

• electric current strength - I (ampere, denoted by the capital letter A in honor of the French researcher André-Marie Ampere (1775−1836), who made a great contribution to the study of electromagnetic phenomena;
• length - L (meter, m);
• time - T (second, s);
• mass - M (kilogram, kg);
• thermodynamic temperature - q (kelvin, K);
• luminous intensity - J (candela, cd);
• amount of substance - N (mol).

Any other physical quantities are combinations of the basic ones. For example, volume is L3 (cubic meter, m3). Current strength in electrical engineering can be determined using Ohm's law and its derivative units - voltage (U, volts) and resistance (R, ohm): I=U / R.

What is tension? Volt [V]

Voltage is a physical quantity that characterizes the ratio of the work of the electric field in the process of transferring a charge from one point A to another point B to the value of this same charge. Simply put, it is the potential difference between two points. Measured in Volts.

The voltage is essentially similar to the amount of water pressure in the pipe; the higher it is, the faster the water flows from the tap. The voltage is standardized and the same for all apartments, houses and garages, equal to 220 Volts with single-phase power supply. Also allowed according to GOST is a 10 percent deviation for the home electrical network. The voltage must be no less than 198 and no more than 242 Volts.

1 Volt contains:

• 1,000,000 microvolts
• 1,000 millivolts

Converting amperes to kilowatts (single-phase 220V network)

An example of how to calculate watts:

• a 15A circuit breaker is installed in the electrical panel (the nominal characteristics are indicated on the housing);
• To calculate the permissible load in a 220 V , the classic formula is used:

P (power, W) = U (voltage, Volt) * I (current, Ampere).

• Substituting the original values, perform the Watt calculation:

220*15= 3 300.

For your information. For convenience, the result obtained can be converted into multiple units: 3,300 W = 3.3 kW (kilowatts).

Using Internet calculators

Another method for quickly and error-free conversion of mA (or μA) into amperes and vice versa is provided by the Internet - calculators, which are offered by numerous sites with electrical engineering topics. Using such calculators is extremely simple: the known current value in amperes (mA, µA) is inserted into the text field on the monitor desktop, marked with the corresponding unit. After this, the value in the units required for the calculation will appear in the adjacent column.

Technical progress and the emergence of new technologies in the near future will make it possible to create devices with much lower power consumption, in which currents will be tens of times less than current values.

Thus, the next, in decreasing order, multiple unit “nano”, equal to one billionth of the basic unit or, in numerical terms, 10-9, will be in demand. So you should prepare for this, but for now you can practice on microamps.

Methods for converting current value

For modern energy-intensive household devices, currents of several amperes or more are quite workable, and the use of this unit of measurement does not cause difficulties. More economical devices include:

• Computers;
• Laptops;
• Smartphones and regular mobile phones;
• MP3 players, set-top boxes;
• LCD - lighting technology;
• LCD - video devices (monitors, televisions);
• Tablets;
• E-books;
• Navigators;
• Video recorders.

The characteristic consumption currents of these devices range from tens to hundreds of milliamps. To correctly convert amperes to milliamps, you should remember that the prefix “milli” means one thousandth of the base unit. You can use either 10-3 or 0.001 as a numerical multiplier. The use of such a multiple or submultiple unit is quite acceptable and legalized in domestic legislation in the form of GOST 8.417−2002 “Interstate standard. Units of quantities."

The abbreviated designation of the prefix “millie” in the Russian version is “m”, in the international version it is “m”. Thus, it is quite clear that 1000 milliamps equals 1 ampere.

How many amperes in a kilowatt and kilowatts in an ampere

kVA to kW - how to correctly convert power

The presented formulas show that direct conversion of power to amperes does not make sense. Depending on the calculation method, it is necessary to additionally take into account voltage or resistance. In two- and three-phase networks, corrections have to be made due to the sinusoidal shape of the signal. An additional influencing factor is the capacitive (inductive) nature of the load.

Table on how to convert watts to amperes

For a fairly accurate selection of circuit breakers and cables, ready-made reference data is suitable. It is recommended to calculate watts with a reserve to prevent overheating of the conductors when connecting the maximum load.

Calculator Watts to A (DC)

Formula for converting W to A

The current I in amperes (A) of a direct current network is equal to the power P in watts (W) divided by the voltage U in volts (V).

Watt to A calculator (1 phase, alternating current)

Formula for converting W to A

The current I in amperes (A) of a single-phase AC network is equal to the power P in watts (W) divided by the product of the power factor PF and the voltage U in volts (V).

How many watts in 1 ampere

By transforming the above formula, you can easily obtain the power value.

P = I × U

Calculating the value of 1 ampere, how many watts it turns out for a regular single-phase network, is quite simple.

P = 1×220 = 220 W = 0.22 kW.

For a three-phase network, a correction factor showing the percentage of electrical energy consumption should be taken into account. Typically it ranges from 0.67 to 0.95 , which depends on the type of equipment and measurement accuracy.

Watt/Ampere conversion table

Converting current to power is of great practical importance. This is necessary when choosing a machine suitable for home or industrial use - a switch that prevents overheating.

Power table:

Watt to A calculator (3 phase, AC, line voltage)

Formula for converting W to A

The current I in amperes (A) of a three-phase line-voltage network is equal to the power P in watts (W) divided by the product of the power factor PF , the voltage U in volts (V) and the square root of three.

How to use an online calculator

Knowing the current parameters, you can independently calculate such an important parameter as power. This value determines the rate of energy consumption per unit of time, so you can calculate additional costs and load on the network when the device is turned on.

What information will you need to enter:

• Mains voltage , which may also vary. Car wiring is usually designed for 12 V voltage. On older models there is still an indicator of 6 V , and on large vehicles - 24 V (buses or trucks with diesel engines).
• Rated current , the value of which can usually be found from the technical data sheet of the equipment. Typically, such information is placed directly on the device body.

The intuitive interface of the calculator will allow you to quickly convert amperes to kilowatts and perform other similar operations. The service will allow you to quickly convert the power consumption of electrical appliances in order to calculate the load on the network. In addition, such a calculator will provide car owners with complete information about the consumed power of the electrical network. This will allow you to easily select a new battery and replace individual electrical wiring components.

Instruments for measuring current strength

The current strength of the electrical network is measured by a special device - ammeter . The type of equipment depends on the network voltage (DC or AC). The data obtained is used to determine the maximum load on the wiring, as well as to calculate the rated and actual power of the electrical appliances used.

Sources

• https://rusenergetics.ru/polezno-znat/milliampery-v-ampery
• https://www.preobrazovaniye-yedinits.info/preobrazovat+milliamper+v+amper.php
• https://pue8.ru/elektrotekhnik/925-tok-v-1-amper-fizicheskij-smysl-odnogo-ampera-v-chem-izmeryaetsya.html
• https://calcsbox.com/post/cto-takoe-amper.html
• https://calcplus.ru/kalkulyator-perevoda-sily-toka-v-moschnost/
• https://etlib.ru/calc/amps-watts-conversion
• https://electrikmaster.ru/kalkulyator-perevoda-vatt-v-ampery/
• https://MicroExcel.ru/watt-to-amper/
• https://remontautomobilya.ru/kalkulyator-dlya-perevoda-sily-toka-v-moshhnost.html

Converting kilowatts to amperes (single-phase 220V network)

How to convert watts to amperes:

• make a list of all consumers: 5 LED lamps of 15 W each, heater 2.3 kW, laptop 120 W;
• recalculate into a single format: 2.3 * 1000 = 2,300 W;
• sum up the obtained values: 75 + 2,300 + 120 = 2,495 W;
• calculate the total current when all consumers are connected simultaneously:

I (current) = P (power) / U (voltage) = 2,495 / 220 = 11.34 A.

Select the machine with the nearest higher nominal value. For this example, a 16 A protective device is suitable. The serial product is designed for a load power of up to 3,500 W, which more than covers the existing needs. The power supply network is made of copper (aluminum) conductors with a cross-sectional area of ​​1.5 (2.5) square meters. mm, respectively.

Conversion table from Volt-amps to Watts

Power losses when connecting a certain load are determined by the correction factor cos ϕ. With linear parameters (incandescent lamps, heating elements), the energy is almost completely used for useful work. In electric motors, reactive components degrade performance characteristics.

The cos ϕ is indicated in the accompanying documentation:

• 0.6-0.7 – worst indicators;
• 0.8-0.9 – average;
• 1 – minimal losses.

When connecting several devices, make a table for convenience. The calculation is made taking into account the active and reactive components.

How many volts does 1 ampere contain?

kW to HP - how to convert correctly

As in the previous example, such questions are asked incorrectly. Converting voltage to current is possible only taking into account:

• electrical resistance of the circuit section;
• power;
• load characteristics;
• constant (variable) parameters of the power supply network.

However, it should be noted that in the Russian Federation, along with the international standard (SI), the non-system unit “Volt-ampere” is used. Its value is equal to 1 W of power, so there is no need to convert using additional coefficients. In this case we are talking about power supply with a sinusoidal signal in a single-phase network.

Volt-amp power refers to the total energy of the power source that is consumed per hour. Measure the actual voltage values ​​at the generator terminals and the current in the connected circuit. This means that in real conditions some of the energy will be wasted on:

• thermal heating;
• electromagnetic oscillations created by reactive components.