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Home > News & Articles > Unit of Inductance: SI Unit (Henry), CGS Units and Relationship between Inductance, Voltage, and Current
Updated on 27th June, 2023 , 6 min read
Inductance is a fundamental concept in electrical engineering that plays a crucial role in the behavior of electrical circuits. It is a property of an electrical conductor or coil that opposes changes in current flow. Understanding the SI unit of inductance is essential for engineers and scientists working with electromagnetic devices and systems. In this article, we will delve into the details of inductance, its significance, and the SI unit used to measure it.
Similar Read: Brewster Law
Inductance refers to the ability of a conductor or coil to store energy in a magnetic field. When an electric current passes through a conductor, it generates a magnetic field around it. This magnetic field induces a voltage in the conductor, which opposes any changes in the current. Inductance is responsible for the behaviour of components like inductors, transformers, and electromagnets.
The equation,
L = ϕ(i) / i
Defines the inductance (L), where (i) represents the magnetic flux of current i and I denotes the current.
Similarly, when relating it to the equationε = dI/dt * L,
We establish the equality between the induced voltage (ε) and the rate of change of current (dI/dt) multiplied by the inductance (L).
In terms of units, inductance (L) is expressed as volt-second per ampere (V·s/A), indicating the combination of voltage and time divided by current.
The SI unit of inductance is called the "Henry" and is represented by the symbol "H." It is named after Joseph Henry, an American scientist who made significant contributions to the field of electromagnetism. The Henry is defined as the inductance of a circuit when an electric current of one ampere produces a magnetic flux change rate of one Weber per second.
1 Henry = 1 Kg m² s⁻²A⁻²
Inductance is closely related to voltage and current in electrical circuits. According to Faraday's law of electromagnetic induction, the voltage induced across an inductor is directly proportional to the rate of change of current passing through it. Mathematically, this relationship is expressed as:
V = L * (dI/dt)
Where:
Inductance, the property of a circuit or component that opposes changes in current, is measured in various units apart from the primary SI unit, the Henry (H). While the Henry is the preferred unit, alternative units are commonly used to represent smaller or larger inductance values. Here are some other commonly used units of inductance:
These units allow for a convenient representation of inductance values across different scales, accommodating a wide range of applications and components. When working with inductors, it is essential to ensure consistency in the chosen unit and perform appropriate conversions when necessary.
|
Unit |
Symbol |
Conversion |
|
Henry (H) |
H |
1 H = 1 H |
|
Millihenry |
mH |
1 H = 1000 mH |
|
Microhenry |
µH |
1 H = 1,000,000 µH |
|
Nanohenry |
nH |
1 H = 1,000,000,000 nH |
|
Picohenry |
pH |
1 H = 1,000,000,000,000 pH |
In addition to the SI unit of inductance (Henry), there are other commonly used units in practical scenarios. Here are some conversion factors:
Inductance finds extensive application in various electrical devices and systems. Some key applications include:
Inductance, a fundamental property of electrical circuits, is influenced by several factors that affect its magnitude and behavior. Understanding these factors is crucial for designing and analyzing circuits involving inductors. Here are the key factors that affect inductance:
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By - Nikita Parmar 2023-08-25 09:48:44 , 11 min readThe SI unit of inductance is the Henry (H).
The unit of inductance, the Henry, is named after Joseph Henry.
One Henry of inductance represents a change in current at a rate of one ampere per second inducing a voltage of one volt in the circuit.
The Henry is defined as the ratio of the induced voltage to the rate of change of current causing that voltage.
Sure! An example of inductance is the coil in an electromagnet, which stores energy in the form of a magnetic field.
The unit Henry is derived from a combination of the base SI units, including kilograms, meters, seconds, and amperes.
Yes, inductance and capacitance are related concepts in the study of electrical circuits. They both store and release energy but in different forms.
While the Henry is the standard SI unit, inductance can also be expressed in other units such as millihenries (mH) or microhenries (µH).
Inductance can be measured using various techniques, including the use of specialized instruments such as an inductance meter or by calculating it based on the physical characteristics of the circuit.
In general, inductance is considered a positive quantity. However, in some specific cases, certain configurations can result in negative or effective negative inductance.
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