Electromagnetic Induction (13 of 15) Transformers, An Explanation

This video goes over an explanation of how transformers function. The equations for the relationship between the voltages, currents on the primary and secondary sides are derived with respect to the number of winding on the coils. Step-up and step-down transformers are also discussed.

Remember these two rules;
If the number of windings on the secondary coil is greater then number of windings on the primary coil then the voltage across the secondary coil will be greater then voltage across the primary coil.

If the number of windings on the secondary coil is greater then number of windings on the primary coil then the current through the secondary coil will be less then current through the primary coil.

Electromagnetic induction is the production of an emf or voltage in a coil of wire due to a changing magnetic field through the coil. Michael Faraday is generally credited with its discovery in 1831. James Clerk Maxwell mathematically described it as Faraday's law of induction. Faraday's law states that an emf will be induced in a coil of wire when the magnetic flux through the coil of wire changes over time. Magnetic flux is calculated as the area of the coil (A) times the magnetic field strength (B).

Lenz's law describes the direction of the induced magnetic field. It states that the direction of the current induced in a coil by a changing magnetic field through the coil is such that the magnetic field created by the induced current opposes the initial changing magnetic field. This is designated by the negative sign at the front of the Faraday's law equation.

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[alanx]

Great vids. thanks
What is actually limiting the output current, without looking at ratios?