In this post, we are going to look at series circuits using the Coulomb Train Model.
The Coulomb Train Model (CTM) is a helpful model for both explaining and predicting the behaviour of real electric circuits which I think is useful for KS3 and KS4 students.
Without further ado, here is a a summary.
A circuit with one resistor
Let’s look at a very simple circuit to begin with:
This can be represented on the CTM like this:
The ammeter counts 5 coulombs passing every 10 seconds, so the current I = charge flow Q / time t = 5 coulombs / 10 seconds = 0.5 amperes.
We assume that the cell has a potential difference of 1.5 V so there is a potential difference of 1.5 V across the resistor R1 (that is to say, each coulomb loses 1.5 J of energy as it passes through R1).
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