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The ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is used to specify the flow of electricity in everyday items like hair dryers, extension cords, and home circuit breakers. One ampere of current represents one coulomb of electrical charge moving past a specific point in one second. The ampere is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism.
Ampere Definition
The ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is used to specify the flow of electricity in everyday items such as hair dryers, extension cords, and home circuit breakers.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Name Origin | Named after French mathematician and physicist André-Marie Ampère (1775–1836) |
| Symbol | A |
| Definition | One ampere is equal to 1 coulomb (C) moving past a point per second |
| Definition (since 2019) | The ampere is defined by fixing the elementary charge e to be exactly 1.602176634×10−19 C, which means an ampere is an electric current equivalent to 1019 elementary charges moving every 1.602176634 seconds or 6.241509074×1018 elementary charges moving in a second |
| Definition (prior to 2019) | The current passing through two parallel wires 1 metre apart that produces a magnetic force of 2×10−7 newtons per metre |
| Relationship to Other Units | 1 A = 1 W/V |
| Relationship to Coulomb | 1 Coulomb = 6.24 x 10^18 electric charges |
| Relationship to Volt | 1 V = 1 kg m2 s-3 A^-1 |
| Relationship to Ohm | 1 Ohm = 1 V/A |
| Relationship to Watt | 1 W = 1 A * 1 V |
| Range | Electric current value can be lower than 0.01 A or higher than 1000 A |
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What You'll Learn
The ampere is a unit of electric current
The ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is used to specify the flow of electricity in everyday objects, from hair dryers to home circuit breakers.
The ampere is named after the French mathematician and physicist André-Marie Ampère (1775–1836), who is considered the father of electromagnetism. In recognition of Ampère's contributions to the creation of modern electrical science, the ampere was established as a standard unit of electrical measurement for electric current at the 1881 International Exposition of Electricity.
The ampere is defined as the unit of electric current that is equal to the flow of one coulomb per second. One ampere of current represents one coulomb of electrical charge (6.24 x 10^18 charge carriers) moving past a specific point in one second. The SI unit of charge, the coulomb, is defined as "the quantity of electricity carried in 1 second by a current of 1 ampere".
The ampere can be alternatively expressed in terms of other units using the relationship I = P/V, and thus 1 A = 1 W/V. The relationship between voltage and current is defined by Ohm's Law, which states that a potential of one volt appears across a resistance of one ohm when a current of one ampere flows through that resistance.
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It is named after André-Marie Ampère
The ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is named after André-Marie Ampère, the French mathematician and physicist born in 1775, who is considered the father of electromagnetism alongside the Danish physicist Hans Christian Ørsted. Ampère's name is also one of the 72 names inscribed on the Eiffel Tower.
André-Marie Ampère studied electromagnetism and laid the foundation of electrodynamics. In recognition of his contributions to the creation of modern electrical science, an international convention, signed at the 1881 International Exposition of Electricity, established the ampere as a standard unit of electrical measurement for electric current.
Ampère's work in the field of electromagnetism was significant. He produced a treatise on mathematical probability, titled 'Considérations sur la théorie mathématique du jeu' (1802; "Considerations on the Mathematical Theory of Games"), which he sent to the Paris Academy of Sciences. He also authored several other works, including 'Théorie des phénomènes électro-dynamiques, uniquement déduite de l'expérience' (Theory of Electrodynamic Phenomena, Uniquely Deduced from Experience) in 1826, and 'Essai sur la philosophie des sciences' (Essay on the Philosophy of Sciences) in 1834.
Ampère's force law states that there is an attractive or repulsive force between two parallel wires carrying an electric current. This force is used in the formal definition of the ampere. The SI unit of charge, the coulomb, was then defined as "the quantity of electricity carried in 1 second by a current of 1 ampere". In other words, one ampere of current represents one coulomb of electrical charge moving past a specific point in one second.
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One ampere is equal to one coulomb per second
The ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is used to specify the flow of electricity in everyday appliances such as hair dryers, extension cords, home circuit breakers, and arc welding equipment.
The ampere is named after French mathematician and physicist André-Marie Ampère (1775–1836), who is considered the father of electromagnetism alongside Danish physicist Hans Christian Ørsted. In recognition of Ampère's contributions to the creation of modern electrical science, an international convention signed at the 1881 International Exposition of Electricity established the ampere as a standard unit of electrical measurement for electric current.
The 2019 revision of the SI defined the ampere by taking the fixed numerical value of the elementary charge e to be 1.602176634 x 10^-19 when expressed in the unit C, which is equal to A⋅s. This means an ampere is an electric current equivalent to 10^19 elementary charges moving every 1.602176634 seconds or 6.241509074 x 10^18 elementary charges moving in a second.
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The ampere is used to specify the flow of electricity in everyday appliances
The ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is used to specify the flow of electricity in everyday appliances.
The ampere is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism. In recognition of Ampère's contributions to the creation of modern electrical science, an international convention signed at the 1881 International Exposition of Electricity established the ampere as a standard unit of electrical measurement for electric current.
The ampere can also be used to calculate the wattage of appliances. For example, if a microwave oven has a rating of 8.3 amps and the home's voltage is 120 volts, the wattage can be calculated as 8.3 amps multiplied by 120 volts, which equals 996 watts.
The ampere is defined as the flow of one coulomb per second. The coulomb is the SI unit of charge and is defined as "the quantity of electricity carried in 1 second by a current of 1 ampere". One ampere of current represents one coulomb of electrical charge, or 6.24 x 10^18 charge carriers, moving past a specific point in one second.
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The ampere is defined by the elementary charge
The ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is used to specify the flow of electricity in everyday appliances such as hair dryers, extension cords, and home circuit breakers.
The SI unit of charge, the coulomb, is defined as the quantity of electricity carried in one second by a current of one ampere. One ampere of current represents one coulomb of electrical charge moving past a specific point in one second. This relationship between the ampere and the coulomb is similar to the relationship between the watt and the joule.
The definition of the ampere in terms of the elementary charge provides a clear and precise definition based on a fundamental invariant of nature. However, it also poses challenges for measurement since the elementary charge is extremely small. The Kibble balance is one of the most accurate methods for realising the definition of the ampere.
The ampere is named after French mathematician and physicist André-Marie Ampère (1775-1836), who is considered the father of electromagnetism.
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Frequently asked questions
Ampere, often shortened to amp, is the unit of electric current in the International System of Units (SI). It is used to specify the flow of electricity.
The ampere is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism.
One ampere is equal to one coulomb (6.24 x 10^18 charge carriers) moving past a point per second. The coulomb is the SI unit of charge.
The ampere (A) is the unit of electric current, and the coulomb is the unit of charge. The relation of the ampere (C/s) to the coulomb is the same as that of the watt (J/s) to the joule.
