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Faraday's law |ε| = N·ΔΦ/Δt with turns, flux, and time selectors, plus the Lenz's-law sign explained — one turn and one weber per second induce exactly one volt.
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
The Faraday Induction EMF Calculator computes the induced electromotive force (|ε|) across a coil using Faraday's law of electromagnetic induction (|ε| = N·ΔΦ/Δt). By configuring the number of coil turns, magnetic flux change, and the time interval across standard metric and SI units, users can instantly determine the induced voltage and understand the directional opposition defined by Lenz's law.
Background
A student is studying electromagnetic fundamentals and verifying the definition of the SI unit Weber.
Problem
Calculate the induced EMF produced by a 1-turn loop experiencing a 1 Wb flux change in 1 second.
How to use
Set turns to 1, flux change to 1 with unit Wb, and time interval to 1 with unit s.
turns: 1, fluxChange: 1, fluxUnit: "Wb", time: 1, timeUnit: "s"Outcome
Calculates an induced EMF of exactly 1 V.
Background
A technician is evaluating an alternator coil where a magnetic flux of 0.5 mWb collapses across 200 turns in 10 ms.
Problem
Determine the total induced voltage generated across the series-wound coil.
How to use
Set turns to 200, flux change to 0.5 with unit mWb, and time interval to 10 with unit ms.
It evaluates the magnitude of induced electromotive force using Faraday's law: |ε| = N·ΔΦ/Δt, where N is turn count, ΔΦ is flux change, and Δt is time.
The negative sign indicates that the induced EMF generates a current whose magnetic field opposes the original change in magnetic flux.
You can select Webers (Wb), Milliwebers (mWb), or Microwebers (µWb).
The tool accepts Seconds (s), Milliseconds (ms), and Microseconds (µs).
One volt is defined as a flux change of exactly one weber per second across a single conductive loop (1 V = 1 Wb/s).
turns: 200, fluxChange: 0.5, fluxUnit: "mWb", time: 10, timeUnit: "ms"Outcome
Calculates an induced EMF of 10 V across the 200 turns.