A transformer is device used to transfer electrical energy from one circuit to another with help of capacitors. Transformers can be step-up transformers or step-down transformers. A changing current in the primary circuit generates a magnetic field. This magnetic field induces a changing voltage in the secondary circuit. This process is called mutual induction.When we have more secondary winding turns than primary winding turns it is a Step up Transformer. Transformer that increases voltage from primary to secondary is called a step-up transformer. Similarly, a transformer designed to do just the opposite is called a step-down transformer.
The transformer is based on two rules: Electromagnetism and Electromagnetic induction.
1.An electric current can produce a magnetic field.
2.A changing magnetic field within a coil of wire induces a voltage across the ends of the coil.
The EMF of a transformer at a particular flux density increases with frequency.
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