In a transformer, electrical power is transferred from primary to secondary

A. Through air
B. By magnetic flux
C. Through the insulating medium 
D. None of these 

Answer: B. By magnetic flux

Explanation: 
A transformer is a device used in the power transmission of electric energy. The transmission current is AC. 

It is commonly used to increase or decrease the supply voltage without a change in the frequency of AC between circuits. 

The transformer works on basic principles of electromagnetic induction and mutual induction.

Step-up Transformer: They are used between the power generator and the power grid. The secondary output voltage is higher than the input voltage.

Transfer of electrical energy from circuit to another.

Transfer of electrical power through electromagnetic induction.

Electric power transfer without any change in frequency.

Two circuits are linked with mutual induction. 

Step down Transformer: These transformers are used to convert high voltage primary supply to low voltage secondary output.



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