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.
Report Abuse. A rheostat is an adjustable resistor that is used to control the electrical resistance of a circuit without interrupting the flow of electrical current to that circuit.Rheostats are used for appliances and other items that need both high voltage and electrical current that can be interrupted. rheostat is simply a coil of resistance wire with a slider on it so that the resistance can be varied. The list of ways that it can be used is very long. Prior to solid state devices they have been used to control lighting or battery charging. speed control of motors. production of variable emf etc.