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Chapter 4: Q16DQ (page 1044)

Can a transformer be used with dc? Explain. What happens if a transformer designed for 120-V ac is connected to a 120-V dc line?

Short Answer

Expert verified

Transformers work only for ac current and if transformer of 120Vac is connected to 120Vdc line, the output voltage will be zero.

Step by step solution

01

Step-1: Principal of transformer

The principal of the transformer is based on the induction process, where to induce a voltage in other devices, the current must be varying with time.

02

Step-2: Explanation

As stated, current must be varying with time to induce a voltage in other devices. And the only case when the current varies with time is the AC current, so the transformers work with AC current only.

If a transformer of 120Vac is connected to120Vdc line, the output voltage will be zero, because the change in current is zero.

Hence, Transformers work only for ac current and if transformer of 120Vac is connected to 120Vdc line, the output voltage will be zero.

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