WEBVTT

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We will explain how to choose the sections of conductive electric wires

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Voltmeter red: wire in 0.5 mm², yellow voltmeter wire of 0.0625 mm² (8 times finer)

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Of course the red wire on voltmeter red, orange, on the yellow :-)!

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I limited the intensity to 2 Amperes, the 2 wires are of copper of the same length

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The voltage drop is 8 times greater in the finer orange wire: 4 Volts

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Against only 0.48 Volts in the red: 8 times less!

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Voltage drop and wire cross-section are proportional REVERSAL!

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Analogy: small pipe, low circulation (intensity) therefore loss of pressure (tension) high

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Resistance is an opposition! Who stands up the most?

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The fine wire is more resistant because the voltage drop is higher

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The end of the strong cross-section presents a weaker resistance: the current flows better

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Resistances and cross section are proportional REVERSAL