Healthy Fats. A classic peanut butter and jelly sandwich has 18 grams of fat. This could be a good chunk of your total daily fat, depending on how many calories you consume. The American Heart Association recommends limiting fat to less than 25 to 35 percent of your total calories.
A rheostat is an electrical device that is used to vary voltage across a network to which it is connected. Since resistance is actually responsible for voltage drop, so by varying the resistance, it is possible to obtain different values of voltage.
Answer Wiki. A rheostat is nothing more than a variable resistor. Traditionally, a rheostat differs from a potentiometer in having only two terminals, one connected to the wiper and one to an end of the resistive element, but since a potentiometer (with three terminals) can also be used as a rheostat, that distinction is often overlooked.