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abcd112358

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https://www.physicsforums.com/threads/a-question-about-an-electrons-movement-in-a-dc-circuit.997736/

The question is the following: What kind of descriptive model could/should one use while first introducing youg students to make the electric circuit less abstract?

The goal of course is to both make the whole system more understandable while not creating wrong preconceptions that might make life harder for students in later grades or even at university.

Some more informations to show where I am coming from:

I am a relatively unexperienced teacher and where I am teaching I am forced (by our curriculum) to teach my students (8th grade) some kind of descriptive model and the students must work with it too.

Here is a rough translation of the passages from the curriculum I am bound to fulfill:

- The students use a descriptive model of an electric circuit to visualize the physical quantities current, voltage and resistor. They also use this model to describe the relations between these physical quantities. The students describe limitations of the model using specific situations.
- While using the model, the students explain observations regarding electrical current and voltage in circuits with a maximum of three resistors. Meaning for example: Why do we see each lightbulb in their respective brightnes for any arangement of three lightbulbs in any combination of shunt connections and series connections.

The concept of energy is taught in 9th grade and electro magnetism (including electric fields and the magnetic fields created by moving charges) are only taught in 10th grade. The students (vaguely) know that there is some kind of magnetic force around a current and that poitive and negavie charges attract each other.

Although I have a somewhat concrete problem here finding a more general answere to this model problem might be interesting to solve for many people.

Ps.: Please excuse all the mistakes I made while writing this. There are (sadly) several reasons why I became a physics teacher and not an english teacher.