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The Henry is a unit of electrical inductance in the International System of Units (SI). It is defined as one kilogram metre squared per second per ampere squared (kg⋅m^2⋅s^-2⋅A^-2). In other words, the inductance of an electric circuit is one Henry when an electric current that is changing at one ampere per second results in an electromotive force of one volt across the inductor. The unit is named after Joseph Henry, the American scientist who discovered electromagnetic induction.
| Characteristics | Values |
|---|---|
| Unit | Electrical inductance |
| Symbol | H |
| Definition | The inductance of an electric circuit is one Henry when an electric current is varying at one ampere per second, resulting in an electromotive force of one volt across the inductor |
| Derived unit based on | Four fundamental units: kilogram, meter, second, and ampere |
| Reduced to base SI units | 1 Henry = 1 kg m2 s-2 A^-2 |
| Other units | Microhenries, millihenries, kilohenries |
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What You'll Learn
- The Henry is the unit of electrical inductance in the International System of Units (SI)
- One Henry is equal to one volt of electromotive force when the current increases by one ampere per second
- The unit is named after Joseph Henry, who discovered electromagnetic induction
- The inductance of a coil depends on its size, the number of turns, and the permeability of the material
- Henry is a derived unit based on four fundamental units: kilogram, meter, second, and ampere
The Henry is the unit of electrical inductance in the International System of Units (SI)
The Henry (H) is the unit of electrical inductance in the International System of Units (SI). It is defined as one kilogram metre squared per second per ampere squared (kg·m^2·s^-2·A^-2).
The unit is named after Joseph Henry, the American scientist who discovered electromagnetic induction independently and at the same time as Michael Faraday in England.
Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The inductance of a coil depends on its size, the number of turns, and the permeability of the material. The Henry is a large unit of inductance, and smaller units such as millihenries (mH) and microhenries (µH) are often used at audio and radio frequencies.
One Henry is equal to the inductance of a conductor in which there is one volt of electromotive force when the current through the conductor is increased by one ampere per second. In other words, if a current of one ampere flowing through a coil produces a flux linkage of one weber turn, that coil has a self-inductance of one Henry.
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One Henry is equal to one volt of electromotive force when the current increases by one ampere per second
The unit of electrical inductance in the International System of Units (SI) is the Henry, abbreviated as H. The unit is named after Joseph Henry, the American scientist who discovered electromagnetic induction.
Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The inductance of a coil depends on its size, the number of turns, and the permeability of the material.
$$V(t) = L\frac{dI}{dt}$$
Where:
- $V(t)$ is the resulting voltage across the circuit
- $I(t)$ is the current flowing through the circuit
- $L$ is the inductance of the circuit
In base SI units, one Henry is equivalent to one kilogram meter squared per second per ampere squared ($kg{m^2}{s^{ - 2}}{A^{ - 2}}$). This can also be expressed as:
$$H = \frac{{kg.{m^2}}}{{{s^2}.{A^2}}}$$
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The unit is named after Joseph Henry, who discovered electromagnetic induction
The unit of electrical inductance in the International System of Units (SI), Henry (symbol: H), is named after American scientist Joseph Henry (1797–1878), who discovered electromagnetic induction. Henry was born in Albany, New York, to Scottish immigrants Ann Alexander Henry and William Henry. He had a challenging childhood, growing up in poverty and losing his father at a young age. As a teenager, he developed an interest in science after reading a book of lectures on scientific topics. He later worked as an apprentice watchmaker and silversmith and briefly considered pursuing a career in theatre.
Henry made significant contributions to science and held prominent positions. He served as the first Secretary of the Smithsonian Institution from 1846 until his death in 1878, influencing the trajectory of American science. During his tenure, the Smithsonian focused on fundamental research, providing essential support for research coordination, publication, and scientific communication. Henry was also a member of the United States Lighthouse Board from 1852 and served as its chairman from 1871 until his death. His work in this area was recognised by the United States Coast Guard, who named a cutter after him.
Beyond his administrative roles, Henry is best known for his discovery of electromagnetic induction, which he achieved independently and concurrently with Michael Faraday in England. This discovery led to the unit of electrical inductance being named in his honour. The Henry is defined as 1 kg⋅m2⋅s−2⋅A−2, representing the relationship between voltage, current, and inductance in a circuit.
Henry's legacy extends beyond his scientific contributions. He was elected vice president of the National Academy of Sciences in 1866 and became president in 1868, serving until his death. He was inducted into the Hall of Fame for Great Americans in the Bronx, New York, in 1915, and several geographical features, including the Henry Mountains in Utah and Mount Henry in California, bear his name. The Joseph Henry Fund was established by the National Academy of Sciences in his memory, reflecting his enduring impact on science and American institutions.
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The inductance of a coil depends on its size, the number of turns, and the permeability of the material
The unit of electrical inductance in the International System of Units (SI) is the Henry, named after Joseph Henry, who discovered electromagnetic induction. One Henry is defined as 1 kg⋅m^2⋅s^-2⋅A^-2. A Henry is the strength of the electromagnetic field in relation to the loops of wire in a coil and the current run through it.
The inductance of a coil depends on several factors, including the size of the coil, the number of turns of wire, and the permeability of the material. Firstly, the number of turns of wire in the coil is important. A greater number of turns will result in greater inductance, as this generates a more substantial magnetic field force for a given amount of coil current.
Secondly, the size of the coil also matters. A larger coil area will result in greater inductance, as it presents less opposition to the formation of a magnetic field. The shape of the coil and the separation of the turns can also impact inductance.
Finally, the permeability of the material is a key factor. The permeability of a material refers to how easily it can become magnetised, and thus, its ability to increase the magnetic flux. A core material with greater magnetic permeability will result in a greater magnetic field flux for a given amount of field force. Ferromagnetic materials such as iron have high permeability and can increase the inductance of a coil by a significant factor.
Inductors can be designed with variable inductance by allowing the number of turns in use to be varied or by changing the core material.
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Henry is a derived unit based on four fundamental units: kilogram, meter, second, and ampere
The Henry is a unit of electrical inductance in the International System of Units (SI). It is derived from four fundamental units: kilogram (kg), meter (m), second (s), and ampere (A).
The unit is defined as one kilogram meter squared per second squared per ampere squared (kg*m^2*s^-2*A^-2). In other words, it is the amount of inductance that will produce an electromotive force of one volt in a closed circuit when the current flowing through it changes at the rate of one ampere per second.
Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The Henry is a large unit of inductance, and in many applications, smaller units such as millihenries (mH) and microhenries (µH) are used.
The unit is named after Joseph Henry, the American scientist who discovered electromagnetic induction independently and at about the same time as Michael Faraday in England.
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Frequently asked questions
Henry is the unit of electrical inductance in the International System of Units (SI). It is derived from four fundamental units: kilogram (kg), meter (m), second (s), and ampere (A).
Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The symbol for Henry is 'H'.
When reduced to base SI units, 1 Henry is equal to one-kilogram meter squared per second per ampere squared (kg m^2 s^-2 A^-2). This can also be written as H = (kg.m^2)/(s^2.A^2).
The unit is named after Joseph Henry, the American scientist who discovered electromagnetic induction at the same time as Michael Faraday in England.
