Recent content by bachir1994

thank you

concerning my level, I am an industrial computer engineer in activity, I am at ease in the mathematical tools used in physics, at ease also in solid and fluid classical mechanics, thermodynamics, special relativity, theory of physics fields. very uncomfortable in quantum mechanics. Thank's

Thank's

Hi , I need to enrich my knowledge in quantum field theory, please refer me to reference books in this branch. Thank's.

Thank you anorlunda for your very clear explanation, that's why the quality of the dielectric in a coaxial cable, support for high frequency energy, is very important. Moreover, under your control, at ultra high frequency, several Ghz, the central conductor become unnecessary, it is called in...

Hi, Is it true that the transmission of energy is not inside an electrical conductor, but outside the metal. this even for frequencies around 50 hertz. Thank's

HelloLast week I was confronted with a situation where an industrial equipment, with a large equipotential mass (metal casing) that was not grounded, had a ground tension, measured with Fluke, of 382 vac. I put a 220 Vac bulb and nothing happens, the bulb remains off and is not burned out. By...

thank you jim hardy your explanation is very good, and it's ok for me. I begin to see things clearer

thank you, Therefore it is the velocity that imposes the torque therefore the current, it is a natural regulation of the phenomenon. Nothing is created, nothing is lost all changes.

Hi Asymptotic, thank you for your good explanations, the motor voltage rating is 400v.

Hello, In three-phase systems, star coupling for example, and in the case where single-phase sources are supplied using the three phases L1, L2 and L3 with a common neutral return, My first question is: when one is balanced il1 = il2 = Il3 is what the current flowing in the neutral is...

Hello, I can not understand that a motor (pumping) requires a current of 63 A under a voltage of 390 vac, and requires a current of 72 A under a voltage of 365 vac. Normally when the voltage increases the current increases with (ohm law). Is that the power delivered by the engine which is 37 kw...

Thank you for your answers, I solved, as even the problem by setting the boot ramp to 03 sec, I guess the generator does not see such a short startup overcurrent. Just before finishing, I have long believed that by increasing the acceleration ramp (either in the dimmer or in the starter) the...

Hello everyone, I am faced with a problem where I have to power a 30kw drilling pump, with a generator of 45kw (model Gesan), but it does not work. At start-up the current reaches the peak of 190 A and descends gradually, for information the start-up of the pump of the drilling is done by a...

thank you for this explanations, so its for this that : the electric potential between two charges Qa and Qb is defined that is the path integral from infinity to B of Qa/(4 π ε0 r)