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Physics - chemistry: methodology. Second year level: reminder Physics-chemistry specialty first year: reminder Physics-chemistry specialty final year: reminder 0:00 law of knots 4:00 law of meshes 9:23 Ohm's law 10:40 Applications Here we recall the laws of knots, law of meshes and Ohm's law as well as the concepts of knot, dipoles in derivation, dipoles in series, and the arrowing of electrical voltages and intensities. The whole is followed by simple applications to check if everything is understood.