ABSTRACT
Mathematics is used in many different engineering applications but are underpinned through certain conventions, which are not always signposted. BODMAS is a classic mathematical convention and very important especially since modern day calculators automatically apply the rules surrounding BODMAS, which means that its reasoning is sometimes lost. Both power and lighting circuits are permitted a certain percentage of voltage drop which is lost across the resistance of its conductors, but excessive amounts robs electrical loads of working voltage. The operation of a thermostat is often based upon the principle of differential expansion between dissimilar metals, that is, a bimetal strip, which causes a contact to make or break at a chosen temperature. During the period when the space heating or water heating is in the ‘on position’, thermostats based upon the bimetal strip principle will maintain the room and water temperature at some predetermined level.
