Coefficients are used to balance chemical equations.
According to the law of conservation of mass, the mass of the reactants in a chemical equation should be equivalent to the mass of the products.
The conservation of mass is achieved in chemical equations is achieved through balancing chemical equations.
<em><u>Balancing chemical equations is a try and error of putting appropriate coefficients to the reactants or products to ensure that the number of atoms of each element are equal on the side of the reactants and that of products. </u></em>
Power and current are both rates. Power is the rate of using energy ... joules per second. Current is the rate of flowing charge ... coulombs per second. Neither quantity depends on how long you keep it up. They're both going on continuously while the vacuum is running.
