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We know that the tension between a perfect current source is 0

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We have Va-Vb= 0 but we also have by ohm's law Va-Vb=RI=5V so 5 = 0?

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We know that the tension between a perfect current source is 0

That's a common misconception held by those first introduced to current sources.

In fact, an ideal current source produces a fixed current regardless of the voltage across.

Put another way, the voltage across an ideal current source is determined by the attached circuit which is, in this case, a resistor.

So, by Ohm's law,

$$V_A - V_B = 5V$$

and there is no contradiction. The current is 5A regardless and the voltage across (and power delivered) is determined by the attached resistance.

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