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
In fact, some consider it the most common chronic disease in children. Symptoms of allergic rhinitis include sneezing, runny nose (rhinorrhea), nasal congestion, itchy nose and post-nasal drip. Some people with allergic rhinitis also may suffer from wheezing, eye tearing, sore throat and chronic cough. In addition, sinus headaches and âpluggedâ ears are common problems.