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
Symptoms include a runny and itchy nose, sneezing, postnasal drip and nasal congestion (blockage). A child with allergies may also have itchy, watery, red eyes and chronic ear problems. Even though itâs commonly known as âhay fever,â allergic rhinitis isnât triggered by hay and doesnât cause fever.