Why are bromine and potassium likely to react with one
another?

Potassium reacts with Bromine to produce Potassium Bromide. ... Bromine needs to gain one electron to have a noble gas configuration or 8 valence electrons. Potassium needs to lose one, so they make a perfect pair to transfer electrons in an ionic bond

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c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current