Three things that an electrical circuit must have to operate is,
A) a source. Example- battery
B) a line. Example- conducting wires that allow the electricity to pass through
and C) a load. Example- A light bulb
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The NEC defines a continuous load as that which may run for three hours or more. Examples of these are: electric heat, water heaters, AC units, and even lighting circuits.
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parallel connected and series connected circuits.AnswerIn terms of connections, there are, in fact, four types of circuit. These are:seriesparallelseries-parallelcomplex'Complex' circuits are circuits that do not fall into one of the other three classifications, e.g. bridge circuits, and which can be solved using circuit theorems, such as Thevenin's, Norton's, etc.
Transmission lines are three-phase systems. There are three line conductors in a three-phase system. However, to reduce electric stress at higher voltages, these lines are frequently made up of 'bundled' conductors -so each line might have two, three, or four separate conductors. In addition, transmission towers usually carry separate circuits -i.e. separate three-phase circuits on opposite sides of each tower. So, in the UK for example, a typical 400-kV transmission line will consist of two, separate, three-phase circuits suspended on each side of each tower, with each line consisting of four bundled conductors. That's 24 conductors.