In a transformer, number of turns in primary coil are 140...

In a transformer, number of turns in primary coil are 140 and that of the secondary coil are 280 . If current in primary coil is $4 \mathrm{~A}$, then that of the secondary coil is
(A) $4 \mathrm{~A}$
(B) $2 \mathrm{~A}$
(C) $6 \mathrm{~A}$
(D) $10 \mathrm{~A}$

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Key Concepts

Transformer

A transformer is a device used in electrical circuits to transfer energy between two or more circuits through electromagnetic induction. It enables the transformation of voltage and current levels while ideally conserving power.

Turns Ratio

The turns ratio is the ratio of the number of windings in the primary coil to that in the secondary coil. It is a fundamental property of transformers that directly influences how voltage and current are converted between the input and output.

Current Ratio

The current ratio in a transformer is the inverse of the turns ratio. This means that when the secondary coil has more turns than the primary, the current in the secondary will be proportionally lower than the primary current, ensuring that the power is ideally conserved.

Conservation of Power

In an ideal transformer, the power delivered to the primary coil equals the power delivered by the secondary coil (disregarding losses). This principle ensures that the product of voltage and current remains constant between the two sides of the transformer.

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