It is difficult for students to understand how electric circuits function. The processes involved are invisible because they occur at the atomic level and thus are abstract in nature. Electricity can not be felt with using the personal senses (unless we receive an electric which is certainly unwanted), electricity cannot be manipulated directly, and what is happening is thus not readily apparent.
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.
Resistors and other circuit elements can be connected in series or in parallel. Resistance in series circuits is the sum of the resistance.
A circuit or wiring diagram is a visual display of an electrical circuit.
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