Question

which thing is neccesary to make a step up transformer

Answer 1

http://www.ehow.com/how_5509667_make-electrical-stepup-transformer.html

Answer 2

no. of turns in primary coil should be lower than the number of turns in secondary coil . . .

Answer 3

good @theyatin u are not taking any support

Answer 4

u can gather data from anywhere. . .
its you knowledge which leads you to right answer. . .
rest is what you have memorized. . .