Ampere - Definition, Conversion, Ampere Prefixes, Calculation (2024)

This article discusses Ampere – the unit of electric current, in detail. Ampere is the unit that we use to quantify the current flowing in a system. An ampere is equivalent to a charge of one Coulomb per second.

Table of Contents

What is Ampere?
- Table of Ampere Unit Prefixes
Ampere Conversion
Conversion of Watt, Volt and Ohm into Ampere
- Calculation of Amps with Watts and Volts
- Calculation of Amps with Volts and Ohms
Ampere Meter/Ammeter
- Types of Ammeter
Frequently Asked Questions – FAQs

What is Ampere?

Ampere is named after the French Physicist and Mathematician Andre-Marie Ampere.
One ampere of current represents one coulomb of electrical charge, i.e. 6.24×10¹⁸ charge carriers, moving in one second.
In other words, “an ampere is the amount of current produced by the force of one volt acting through a resistance of one ohm”.

Ampere is defined as the unit of electric current that is equal to the flow of one Coulomb per second.
The relationship between ampere and coulomb is represented as follows:

Ampere = 1 Coulomb / Second

At any given point in an area experiencing current, the Ampere value will increase proportionately if the charge on particles moving through it increases.

Table of Ampere Unit Prefixes

A huge range of electric current values is encountered in electrical and electronic engineering.
An electric current value can be lower than 0.01 A or higher than 1000 A.
By using multiples and submultiples of the standard unit we can avoid writing too many zeroes to define the position of the decimal point.
The table below lists some of the commonly used ampere unit prefixes.

Name	Symbol	Conversion	Example
microampere(microamps)	μA	1 μA = 10^-6A	I = 40 μA = 40 × 10^-6A
milliampere(milliamps)	mA	1 mA = 10^-3A	I = 2 mA = 2 × 10^-3 A
ampere (amps)	A	–	I = 20 A
kiloampere(kiloamps)	kA	1 kA = 10³A	I = 4 kA = 4 × 10³ A

Ampere Conversion

Unit conversion is crucial in solving problems. Below we have listed examples of ampere conversions from one scale to another.

Conversion of amps (A) to kiloamps(kA)

One kiloamp (kA) equals a thousand amps (A).

1 kA = 1000 A or 1 × 10³ A

For example, 5 amperes of current can be converted to kiloamperes as follows:

5 A × 1000 = 5000 A or 5 kA

Conversion amps (A) to milliamps (mA)

One milliampere is equal to 1000 amperes.

1 mA = 1000 A

For example, 2 A to milliampere is converted as follows:

2 A/1000 = 0.002 A or 2 × 10^-3 A = 2 mA

Conversion of amps (A) to microamps (μA)

One Ampere is equal to 1000000 or 10^-6 microamperes.

1 μA = 1000000 A

For example, 5 A is converted to microamps as follows:

5 A / 1000000 = 0.000005 A or 5 × 10^-6 A = 5 μA

Conversion of Watt, Volt and Ohm into Ampere

The electric current value can be calculated by knowing the voltage, power and resistance values.

Calculation of Amps with Watts and Volts

The power of the circuit is given by the following formula:

P (Watt) = V (Volt) × I (Ampere)

Rearranging the above equation, we can calculate the value of electric current as follows:

I (Ampere) = P (Watt) / V (Volt)

Solved Example:

What is the current flow in a circuit that consumes 50 W of power and has a supply voltage of 10 V?

Using the equation, we can calculate the current as follows:

I (A) = 50 W/10 V = 5 A

Calculation of Amps with Volts and Ohms

The resistance of a circuit is calculated using the following formula:

V (Volt) = I (Ampere) × R (Ohm)

Rearranging the above formula, we can calculate the value of electric current as follows:

I (Ampere) = V (Volt) / R (Ohm)

Solved Example:

What is the current in a circuit having a voltage of 25 V with a resistance of 5 Ω?

Using the above equation, we can calculate the value of the current as follows:

I = 25 V/5 Ω = 5 A

Similar Articles

Ampere Meter/Ammeter

Ampere meter, commonly known as Ammeter is an electrical instrument used to measure electrical current in Amperes. The electrical current on the load is measured with the help of an Ampere meter by connecting it in series to the load. It has zero resistance, and so the measured circuit remains unaffected.

What happens when an ammeter is connected in parallel to load?

The ammeter cannot be connected in parallel to the load because of its low resistance.
If it is connected in parallel, it becomes a short circuit path allowing all the current to flow through it which may lead to the burning of the metre due to the high current value.
An ideal ammeter has zero impedance, so the instrument’s power loss is zero.
But this ideal condition is not achievable practically.

Types of Ammeter

The classification of the ammeter is based on the construction design and the type of current that flows through the ammeter.
Based on the design of construction it is classified as follows:

Moving iron ammeter
Rectifier type ammeter
Permanent moving coil ammeter
Electro-dynamometer ammeter

Based on the type of current that flows through it, it is classified as follows:

DC ammeter
AC ammeter

The DC ammeters are mostly permanent moving coil type ammeter. The other types of ammeter can measure both AC and DC current.

Frequently Asked Questions – FAQs

What is Ampere?

Ampere is defined as the unit of electric current that is equal to the flow of one Coulomb per second.

How is Ampere measured?

Ampere meter, commonly known as Ammeter is an electrical instrument used to measure electrical current in Amperes.

Can Ampere be negative?

Yes, the value of ampere can be negative.

Why is Ampere required?

Ampere is required to quantify the current flowing in a system.

What happens when an ammeter is connected in parallel to the load?

When an ammeter is connected in parallel it becomes a short circuit path allowing all the current to flow through it which maybe lead to the burning of the meter due to the high value of current.

Watch the video and understand electricity in just 5 minutes!

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FAQs

Ampere - Definition, Conversion, Ampere Prefixes, Calculation? ›

The ampere is a unit of electric current that is equal to one Coulomb per second of flow. Mathematically, 1 ampere is expressed as-1 Ampere = 1 Coulomb / 1 Second. The Electric Current can be measured by using the following formula: I = V/R. Ammeter is used to measure the current flowing in a system.

Read On ›

What is the prefix for ampere? ›

Table of Ampere Unit Prefixes

Name	Symbol	Example
microampere(microamps)	μA	I = 40 μA = 40 × 10^-⁶A
milliampere(milliamps)	mA	I = 2 mA = 2 × 10^-³ A
ampere (amps)	A	I = 20 A
kiloampere(kiloamps)	kA	I = 4 kA = 4 × 10³ A

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What is ampere conversion formula? ›

Amps = Watts / Volts

Examples: 4160 Watts / 208 Volts = 20 Amps. 3600 Watts / 240 Volts = 15 Amps.

How is ampere defined? ›

One ampere is the current in which one coulomb of charge travels across a given point in 1 second.

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What is the conversion of 1 ampere? ›

Ampere Conversion Table

amperes	milliamperes	abamperes
1 A	1,000 mA	0.1 abA
2 A	2,000 mA	0.2 abA
3 A	3,000 mA	0.3 abA
4 A	4,000 mA	0.4 abA

16 more rows

Find Out More ›

What are the 7 metric prefixes? ›

Prefix Total

Eight original SI prefixes were officially adopted: deca, hecto, kilo, myria, deci, centi, milli, and myrio, derived from Greek and Latin numbers. Initially, all prefixes were represented by lowercase symbols. The first General Conference on Weights and Measures (CGPM) approves the 8 prefixes for use.

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How to calculate for amps? ›

Calculate the Amperage: Divide the wattage by the voltage using the formula A = W / V.

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What is the mathematical formula of ampere? ›

The equation of Ampere's Law can be written as. ⇀ d l ⇀ = μ 0 I . Ampere's law provides an additional method for calculating the magnetic field caused by a given current distribution.

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What is the metric conversion of amps? ›

A milliampere is 1 thousandth of the unit Ampere hence 1 Ampere is equal to 1000 milliamperes. Going further, 1 milliampere is equivalent to 1000 microamperes and so on. Going in the opposite direction, 1 Ampere is . 001 Kiloampere, or 1000 Amperes is 1 Kiloampere.

How do you convert ampere to current? ›

Using Ohm's Law, it's possible to express the current in amperes as an expression using resistance and voltage. The current in amperes is equal to the potential difference in volts divided by the resistance in ohms.

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What is ampere for dummies? ›

Amps, short for Amperes, measure the current, or the rate at which electricity flows in a circuit. Referring back to our water analogy, if voltage is the water pressure, then current would be the amount of water flowing through the pipe.

Read The Full Story ›

What is the rule of ampere? ›

Ampere's Law states that the magnetic field produced by an electric current is proportional to its magnitude, with a proportionality constant equal to the permeability of free space. where I is electric current, B is magnetic field and μ 0 is permeability of free space. Figure:1. An Ampere circuit.

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What is ampere in math? ›

An ampere, or amp for short, is the internationally used unit to measure current. The symbol for ampere is A, and it is equal to the flow of 1 coulomb per second. One coulomb is 6.24 x 1018 electrons. Other units are used with electricity, such as the watt and volt.

Get More Info Here ›

What is an ampere a equivalent to? ›

The ampere (/ˈæmpɛər/ AM-pair, US: /ˈæmpɪər/ AM-peer; symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI). One ampere is equal to 1 coulomb (C) moving past a point per second.

What is the new definition of 1 ampere? ›

An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor. One ampere of current represents one coulomb of electrical charge (6.24 x 10¹⁸ charge carriers) moving past a specific point in one second.

What is a watt vs amp? ›

Amps, Watts, and Volts are all different units used to describe different aspects of electricity: Amps(Amperes) measure the flow of electrical current (charge) through a circuit. Watts measures the rate of energy consumption or generation, also known as power.

View Details ›

What is the symbol for ampere? ›

The ampere, symbol A, is the SI unit of electric current.

What is the prefix centi? ›

Centi- (symbol c) is a unit prefix in the metric system denoting a factor of one hundredth. Proposed in 1793, and adopted in 1795, the prefix comes from the Latin centum, meaning "hundred" (cf. century, cent, percent, centennial).

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How do you write 1 ampere? ›

Since power is defined as the product of current and voltage, the ampere can alternatively be expressed in terms of the other units using the relationship I = P/V, and thus 1 A = 1 W/V. Current can be measured by a multimeter, a device that can measure electrical voltage, current, and resistance.

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What is the abbreviation for ampere? ›

An ampere is a unit which is used for measuring electric current. The abbreviation amp is also used.

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Ampere - Definition, Conversion, Ampere Prefixes, Calculation (2024)

What is Ampere?

Table of Ampere Unit Prefixes

Ampere Conversion

Conversion of amps (A) to kiloamps(kA)

Conversion amps (A) to milliamps (mA)

Conversion of amps (A) to microamps (μA)

Conversion of Watt, Volt and Ohm into Ampere

Calculation of Amps with Watts and Volts

Calculation of Amps with Volts and Ohms

Ampere Meter/Ammeter

What happens when an ammeter is connected in parallel to load?

Types of Ammeter

Frequently Asked Questions – FAQs

What is Ampere?

How is Ampere measured?

Can Ampere be negative?

Why is Ampere required?

What happens when an ammeter is connected in parallel to the load?

Watch the video and understand electricity in just 5 minutes!

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FAQs

Ampere - Definition, Conversion, Ampere Prefixes, Calculation? ›

What is ampere for dummies? ›