Devices that allow you to do work in an easier way.​

The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw, and the wedge, although the latter three are actually just extensions or combinations of the first three.

The most important devices that made work easier are:

The wheel

The axle

The lever

The inclined plane

The pulley

The screw

The wedge

these are known as the the "six simple machines"

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