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Transformers are used to

Q. Transformers are used to
 A   convert AC into DC
 B   convert DC into AC
 C   step up DC voltage
 D   step up or step down voltage
Answer:-step up or step down voltage
Explanation:  

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. A transformer consists of a soft iron coil with two coils wound around it which are not connected to one another.

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Written by Prajwal Kumar

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Nodes are

The instrument used to measure the radioactivity is