Me with this questions and give a brief explanation > _< i don't understand or get what it means :

The answer to your question is: No, this equation is not balanced.

Explanation:

To know if a equation is balanced, we must know the Lavoisier law of conservation of mass that states that " In an isolated or closed system, matter can not be created or transform".

This means that that matter in the reactants is equal to the mass in the products.

Equation

                            S  +  3O₂   ⇒   SO₃

                           Reactants         Products

                            1 sulfur               1 sulfur

                            6 oxygens         3 oxygens

As the amount of oxygens in the reactants is higher than in the products, the equation is not balanced.          

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