A key difference in an AC relay is the presence of a "shading coil". The purpose of this coil is to keep the relay on when the current drops to zero during phase change (note that in AC power the current and voltage are alternating in a sine wave around 50/60 times per second). The shading coil retains some magnetic energy and essentially holds the relay ON when the current drops to zero momentarily due to the AC waveform.
Answer:
mathClass = Roster([('Jacob', 65), ('Frankie', 86), ('Lina', 94), ('Arnold', 63), ('Amanda', 87)])
Explanation:
An Instance of a class, refers to making a new object of that class. They belong to the class from which they are derived. The meaning of this is that every instance of a class that is created, will have its own set of variables with different values initialized by the constructor call, so we can make several objects of a class and define their behavior. In this question, we are asked to make a new instance of the class Roster called mathClass and at the constructor call we pass the variables of this new object as an argument.
Answer:
different or difference between Dot-matrix and Daisy-wheel printer
