Therefore students can have difficulty grasping the ideas and principles involved and constructing understanding. Misconceptions may develop, with students believing electricity is a substance which gets used up. Understanding of electricity involves students acquiring a specialised specific set of vocabulary. However, although we cannot see electrical charges moving and transferring energy, the effect of the transfer can be seen.
An electric circuit is a path in which electrons from a voltage or current source flow.
The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground". The exit point is called the "return" because electrons always end up at the source when they complete the path of an electrical circuit.
circuit diagrams utilise special symbols recognized by everyone who uses the drawings. The symbols on the drawings show how components like resistors, capacitors, insulators, motors, outlet boxes, lights, switches, and other electrical and electronic components are connected together.
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