What is another way of writing 3.78 x 10^5

The other way of writing the given number is 3,78,000.

Explanation:

The given format of the number is in scientific notation form which can also  be written in Standard from.

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