Which of the following are true? (Select all that apply.) (a) A transformer is u

Question

Which of the following are true? (Select all that apply.) (a) A transformer is used to change frequency. (b) A transformer is used to change voltage (c) If a transformer steps up the current, it must step down the voltage (d) A step-up transformer steps down the current (e) The standard household wall-outlet voltage in Europe is 220 V, about twice that used in the United States. If a European traveler wants her hair dryer to work properly in the United States, she should use a transformer that has more windings in its secondary coil than in its primary coil (f) The standard household wall-outlet voltage in Europe is 220 V, about twice that used in the United States. If an American traveler wants his electric razor to work properly in Europe, he should use transformer that steps up the current.

Explanation / Answer

A) not true (frequency remaining same)

B)True

C)true(as power has to remain constant)

D)True

E)True( she wants to step up the voltage)

F)True

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