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
A mother has no physical signs of Rh disease, but her Rh positive baby can have problems if the mother has developed antibodies. The following are the most common symptoms of Rh disease in the fetus. However, each pregnancy may have different symptoms of the condition.