7. List one example from your daily life (not doing your chemistry homework) in which you converted between two different units. Explain why the conversion was needed.​

when my friend weighs himself in stone and I do it in kg.

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

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.