Electricity & Magnetism
Self-Inductance
EMF induced by changing current in same circuit.
Variables
εV
Induced EMF
Self-induced EMF
In SI units: kg·m²/(A·s³)
LH
Inductance
Self-inductance
In SI units: kg·m²/(A²·s²)
dI/dtA/s
Current rate
Rate of current change
Derivation
ε = -dΦ/dt = -L(dI/dt) where Φ = LI.
Your notes
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Other electricity & magnetism formulas with the same quantities
- Mutual Inductance EMF (Electromagnetic Induction) shares Induced EMF, Current rate
- Motional EMF (Electromagnetic Induction) shares Induced EMF
- RL Time Constant (Electromagnetic Induction) shares Inductance
- Inductive Reactance (AC Circuits) shares Inductance
- Resonant Frequency (LC) (AC Circuits) shares Inductance
Where this formula is listed
- Electricity & Magnetism formulas, under Electromagnetic Induction, alongside Magnetic Flux and Transformer Equation.
- In the electricity & magnetism list it comes after Motional EMF and before Inductor Energy.
- Electricity & Magnetism formula sheet, one of 48 formulas printed with symbol keys and SI units.
- The full formula index, grouped by category and topic.
Common questions
What is the Self-Inductance formula?
Self-Inductance is written ℰ = −L(dI/dt). EMF induced by changing current in same circuit. It belongs to Electricity & Magnetism, under Electromagnetic Induction.
What are the units in ℰ = −L(dI/dt)?
In SI units, ε is induced emf, measured in kg·m²/(A·s³); L is inductance, measured in kg·m²/(A²·s²); dI/dt is current rate, measured in A/s.
How is the Self-Inductance formula derived?
ε = -dΦ/dt = -L(dI/dt) where Φ = LI. The result is ℰ = −L(dI/dt).