Unit Information
Microhenry
A metric subunit of electrical inductance equal to one millionth of a henry (10⁻⁶ H). Widely used for small inductors in high-frequency circuits, RF applications, and switching power supplies. Common for surface-mount inductors, toroidal inductors, and RF chokes used in impedance matching, resonant circuits, and electromagnetic compatibility applications. Essential for high-frequency circuit design where small inductance values control signal integrity and prevent electromagnetic interference.
Nanohenry
A metric subunit of electrical inductance equal to one billionth of a henry (10⁻⁹ H). Used for very small inductors in high-frequency applications, microwave circuits, and RF integrated circuits. Common for bond wire inductance, trace inductance on printed circuit boards, and parasitic inductance in high-speed digital systems. Critical for RF design, microwave engineering, and high-speed digital applications where parasitic inductance affects signal integrity and circuit performance.
Conversion Tips
- Remember to check your decimal places for accuracy.
- This conversion is commonly used in international applications.
- Consider the context when choosing precision levels.
- Double-check calculations for critical applications.
Learn More About Inductance
Scientific Overview
Inductance is the property of an electrical conductor by which a change in electric current through it induces an electromotive force (EMF) in both the conductor itself (self-inductance) and in any nearby conductors (mutual inductance). It is measured in henries (H).
Historical Background
The phenomenon of inductance was discovered in the 1830s by Michael Faraday and Joseph Henry independently. Faraday formulated the law of electromagnetic induction, while Henry demonstrated self-inductance. The unit henry is named after Joseph Henry.
Real-World Applications
Power Electronics
Inductors store energy and filter current in switching power supplies.
Signal Processing
Inductors are used in tuned circuits for frequency selection in radios and TVs.
Electric Motors
Inductance principles are fundamental to the operation of transformers and electric motors.
EMI Suppression
Inductors block high-frequency noise in electronic circuits.
Wireless Charging
Inductive coupling enables contactless energy transfer.
Interesting Facts
- A changing current through an inductor creates a magnetic field that opposes the change.
- Superconducting magnets can have inductances of thousands of henries.
- The human body has negligible inductance compared to typical electronic components.
- Air core inductors have lower inductance but can operate at higher frequencies.
- Inductance causes the "kickback" voltage spike when current is suddenly interrupted.
Key Formulas
Faraday's Law
ε = -L(di/dt)Energy Storage
E = ½LI²Inductance of Solenoid
L = μN²A/lRL Time Constant
τ = L/RMutual Inductance
M = k√(L₁L₂)