The author organized this passage by a comparing and contrasting the different types of energy. b describing a problem and explaining how to solve it. c sequencing the changes that energy goes through. d illustrating the law of conversation of energy with examples -reading science-energy transformation 5.6a uses of energy

the answer is learned

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

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >