A rheostat is a device which is used to vary the resistance in an electrical circuit without interrupting the circuit.heostats are a kind of potentiometer. These devices can be used in a variety of settings, and are usually designed to be sealed so that environmental factors cannot interfere with the function of the circuit.
This chemical can cause allergic rhinitis and its symptoms, including a runny nose, sneezing, and itchy eyes. In addition to tree pollen, other common allergens include: grass pollen
Hay fever is also known as seasonal allergic rhinitis. The symptoms of hay fever include sneezing, a runny nose and itchy eyes which are triggered by an allergic reaction to grass, tree and weed pollen as well as other particles in the air, usually in the spring and summer.