Can we a transformer be used to step up ...

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

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What is the principle of the working of a transformer ?
What is the basic difference between A.C. voltage and D.C. voltage?
How do the induced emf develop in the secondary coil ?

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Assertion : An ideal transformer does not vary the power. Reason : An transformer is used to step-up or step-down ac voltages.

If both assertion ans reason are true ans reaason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion istrue but reason is false.

If both assertion and reason are false.

A step up transformer is used to

increase the current and increase the voltage

decrease the currentd and increase the voltage

increase the current and decrease the voltage

decrease the current and decrease the voltage

Assertion : A given transformer can be used to step-up ot step-down the voltage. Reason : The output voltage depends upon the ratio of the number of turns of the two coils of the transformer.