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Induced Voltage Calculator

V ∞ f * N [ induced voltage is directly proportional to frequency and number of coil turns ]


LinkedIn shared lecture to demonstrate electro-magnetic induction principle
from Professor Walter Lewin

Electromotive force (EMF) is directly proportional to magnetic flux based on Faraday’s Law of Electromagnetic Induction. EMF = -N * d(magnetic flux)/dt

Change in Magnetic Flux Causes EMF: When a magnetic field changes with time (either in magnitude or direction), it induces a voltage (EMF) in a conductor.

Stronger Magnetic Fields Yield Higher Flux: A larger magnetic field leads to greater flux, which means any change in flux will result in greater EMF.

More Turns Amplify EMF: A coil with more turns will experience a stronger induced EMF because the effect is cumulative across each loop.

Faster Flux Change = Greater Induced Voltage: If the magnetic flux changes more rapidly, a higher voltage is induced.

Find Induced Voltage in Inductor

Given a Bushing Current Transformer (BCT) with a shorted secondary terminal. The BCT has 300 milliHenry (mH) rating and it has 0 to 200 mA current flowing through it every 2 microsecond. An electrical engineer remove the shorting wire on the BCT secondary terminal because he was told that the circuit was de-energized. Assuming there is a back feed circuit that energize the circuit at exact time the electrical engineer remove the shorting wire.

Calculate the induce voltage that the engineer will be exposed?

Important to remember: Do not remove the shorting wire on any energized current transformer (CT) or BCT secondary terminal block because of very high induced voltage that can generate an arc flash hazard.

The answer is valid if the units of measurement are in mH, mA, and microsecond. So you need to make sure measurement conversion to satisfy the calculator algorithm.

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