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.
Representing Resistance on the CTM
To measure resistance, we would set up this circuit.
We can represent this same circuit on the CTM as follows:
This way of thinking about current is consistent with the formula charge flow = current x time
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