Abhenries to Megahenries Converter

How to Convert Abhenries to Megahenries

To convert an inductance measurement from abhenries to megahenries, divide the inductance value by the conversion factor. Since one abhenry is equal to 10^-15 megahenries, you can use this formula:

The inductance in megahenries is equal to the abhenries divided by 10¹⁵.

How Many Megahenries Are in a Abhenry?

There are 10^-15 megahenries in one abhenry.

What Is a Abhenry?

The abhenry (symbol: abH) is the unit of electrical inductance in the centimetre–gram–second electromagnetic (CGS-EMU) system of units. One abhenry is equal to exactly 10⁻⁹ henries (one nanohenry). The name “abhenry” is short for “absolute henry” in the CGS-EMU system. In this system, the fundamental electromagnetic units are derived from the centimetre, gram, and second, with the magnetic constant (μ₀) set to unity (dimensionless). The abhenry is numerically equal to the nanohenry (nH), making it a very small unit of inductance. Values in abhenries are typically encountered when working with parasitic inductances of short conductors, bond wires in integrated circuits, and PCB vias. While the CGS-EMU system has been largely superseded by SI units, the abhenry still appears in older physics textbooks, historical scientific literature, and in some specialised fields that traditionally used the CGS system. Understanding the abhenry helps in reading and interpreting these older sources.

One abhenry is equal to:

• 10⁻⁹ henries (H) = 1 nanohenry (nH)
• 10⁻⁶ millihenries (mH)
• 0.001 microhenries (μH)
• 1.1127 × 10⁻²¹ stathenries (stH)

What Is a Megahenry?

The megahenry (symbol: MH) is a unit of electrical inductance equal to one million (10⁶) henries. The prefix “mega” denotes a factor of 10⁶ in the International System of Units. The megahenry is an extremely large unit of inductance that has virtually no practical application in real-world electronics or electrical engineering. No physical inductor or coil achieves inductance values anywhere near one megahenry. This unit exists primarily for completeness within the metric prefix system and occasionally appears in theoretical calculations involving extremely large electromagnetic systems or in educational contexts to illustrate the range of possible inductance values. In geophysics, the effective inductance of very large-scale natural electromagnetic systems (such as the Earth’s magnetosphere interacting with solar wind currents) could theoretically be described using very large inductance values, though such descriptions are uncommon in practice.

One megahenry is equal to:

• 10⁶ henries (H)
• 10⁹ millihenries (mH)
• 10¹² microhenries (μH)
• 1,000 kilohenries (kH)
• 0.001 gigahenries (GH)

Understanding Electrical Inductance Units

Inductance is the property of an electrical conductor by which a change in current flowing through it induces an electromotive force (EMF) in the conductor itself (self-inductance) or in a nearby conductor (mutual inductance). It is one of the fundamental quantities in electromagnetism, along with resistance and capacitance.

The physical basis of inductance is Faraday’s law of electromagnetic induction: a changing magnetic field induces an electric field. When current flows through a conductor, it creates a magnetic field. If the current changes, the magnetic field changes, which induces a voltage that opposes the change in current (Lenz’s law). The ratio of the induced voltage to the rate of current change is the inductance.

Major Unit Families

• SI units: The henry (H) is the SI unit of inductance, with standard metric prefixes: μH (microhenry, 10⁻⁶ H), mH (millihenry, 10⁻³ H), kH (kilohenry, 10³ H), MH (megahenry, 10⁶ H), GH (gigahenry, 10⁹ H).
• CGS-EMU: The abhenry (abH) is the inductance unit in the CGS electromagnetic system. 1 abH = 10⁻⁹ H = 1 nanohenry. It is a very small unit.
• CGS-ESU: The stathenry (stH) is the inductance unit in the CGS electrostatic system. 1 stH ≈ 8.988 × 10¹¹ H. It is an enormously large unit due to the factor of c² in the conversion.

Inductance in Practice

• Electronic components: Chip inductors: 0.001–1,000 μH. Power inductors: 0.1–100 mH. Transformers: 0.01–100 H.
• Parasitic inductance: PCB traces: ~1 nH/cm. IC bond wires: 1–5 nH. Through-hole vias: 0.5–2 nH.
• Audio equipment: Speaker voice coils: 0.5–3 mH. Crossover network inductors: 0.1–10 mH.
• Power systems: Large power transformers: 0.1–10 H. Reactor coils: 0.01–1 H.

Converting Between Inductance Units

All inductance units measure the same physical quantity, so converting between them is a matter of multiplying by the appropriate conversion factor. For SI prefix conversions, each step is a factor of 1,000. The CGS conversions involve fixed factors: 1 abH = 10⁻⁹ H (exact) and 1 stH = c² × 10⁻⁹ H (where c ≈ 2.998 × 10¹⁰ cm/s).

Tips for Inductance Conversions

• For SI metric conversions (μH, mH, H, kH, MH, GH), each prefix step is a factor of 1,000.
• The abhenry equals exactly 10⁻⁹ henries, which is the same as 1 nanohenry (nH). This makes conversion straightforward.
• The stathenry is enormous: 1 stH ≈ 899 billion henries. The conversion factor involves the speed of light squared (c²).
• The ratio of 1 stathenry to 1 abhenry is c² (in CGS units) ≈ 8.988 × 10²⁰. This reflects the fundamental relationship between electrostatic and electromagnetic units.
• Most practical electronic inductors have values between 0.01 μH and 100 mH. Very few components exceed 10 H.
• When reading component datasheets, pay attention to whether the inductance is in μH, mH, or H. A factor-of-1,000 error can be catastrophic in circuit design.
• In RF (radio frequency) circuits, inductance values are typically in the 0.1–100 μH range. In power electronics, they are typically 1–100 mH.

Abhenries to Megahenries Conversion Table

The following table shows conversions from abhenries to megahenries.

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