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An electrical device, without continuously moving parts, which, by electro-magnetic induction, transforms energy from one or more circuits to other circuits at the same frequency, usually with changed values of voltage and current.
What are the main components of a transformer?
There are three basic parts of a transformer:
- an iron core which serves as a magnetic conductor,
- a primary winding or coil of wire and.
- a secondary winding or coil of wire.
What is the principle of a transformer?
A transformer operates on the principle of electromagnetic induction. It has a magnetic core over which two sets of windings, termed as primary and secondary, are suitably placed. When one of the windings is connected to an AC supply, an emf is induced on the other winding which is proportional to the number of turns.
What is the formula for Transformers?
The transformer formula is given by, Vp / Vs = Np / Ns. Vp = Np / Ns ×Vs. = 60 / 100 x 250. = 150 V. Example 2. The number of primary and secondary windings is 100 and 350 respectively.
Why do we test a current transformer?
Magnetizing current test of transformer is performed to locate defects in the magnetic core structure, shifting of windings, failure in between turn insulation or problem in tap changers . These conditions change the effective reluctance of the magnetic circuit, thus affecting the current required to establish flux in the core.
What is a transformer in physics?
Home > GCSE Physics > Transformers. A transformer is a device that changes (transforms) and alternating potential difference (voltage) from one value to another value be it smaller or greater using the principle of electromagnetic induction .
What is the output voltage of a transformer?
The output voltage of a transformer can be less than, greater than, or equal to the input voltage , depending on the ratio of the number of loops in their coils. Some transformers even provide a variable output by allowing connection to be made at different points on the secondary coil.