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Can a transformer be used to alter DC vo...

Can a transformer be used to alter DC voltage?

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Why cannot a transformer be used to step up d.c. voltage ?

Can we a transformer be used to step up or step down a D.C. voltage? Explain.

Is energy produced when a transformer steps up the voltage?

A transformer is used to step down a.c.voltage. What appliance do you use to step down d.c. voltage ?

Can a transformer work on d.c. ?

Suppose we have a transformer which converts 220 V AC to 12 AC. In the transformer when we apply 220 V DC voltage then usually coil is burned. Why ?