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A transformer does not normally contain a capacitor. However, you might be thinking of a 'd.c. power supply', which consists of a transformer, rectifier, and smoothing circuits. The smoothing circuits will contain capacitors.
Transformers are use in circuits to step up and down voltages.
A 'current transformer' (CT) is classified as an instrument transformer, which means it is used to provide a small secondary current that is in proportion to its large primary current, for purposes of metering or protection. At the same time, it electrically-isolates the secondary (metering) circuits from the primary circuits (which are often high-voltage circuits) for the purpose of safety.
Not clear what your question is. First of all, circuits are not classified as DC and AC. Circuits are what they are, and you can apply either AC or DC to any circuit. However, considering a circuit that was designed only for use with DC applied. Still your question is unclear. What is transformer action? "Transformer Action" happens in a transformer.
Transformer in Hindi is called "ट्रांसफ़ॉर्मर" (pronounced as "transformer"). It is a device used to transfer electrical energy between two or more circuits through electromagnetic induction.
The container the transformer core and windings are placed inside is the tank.
It uses electromagnetic induction to transfer energy between separate circuits.
No transformers only work with AC.
A small step-down transformer in electrical circuits is used to reduce the voltage from a higher level to a lower level. This helps to safely power devices that require lower voltage levels, protecting them from potential damage.
They are magnetically coupled--a current in one circuit induces a current in the other one in both a transformer and an induction motor.
The predominate liquid used inside a filament transformer is mercury. Mercury is used to keep the transformer cool when under heavy use. Mercury is a cheap and long lasting liquid.
Isolation transformers are used to isolate one circuit from another. Highly sensitive circuits may require isolation from high power circuits, for example.