Created it, 06/02/22

Last update it, 06/02/22

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FOOT-NOTE : You will find several questionnaires which will allow you to test acquired knowledge, answers to these tests you, as for them, being given in the various following pages. With this process, you can thus immediately ensure you of the exactitude of your answers. (Each question is worth 2 points).

We do not address to our fellow-members for these tests, nevertheless, if you wish it to carry out a small revision in the fundamental field of electronics, one leaves it to to you to supplement your knowledge.

Haut de page Test N° 1

1 - How does one state the fundamental law of electrostatics on the electric charges ?

2 - What represents the molecule ?

3 - Of which sign are the loads had by the protons and the electrons ?

4 - How states the law relating to the forces which are exerted between two magnetic poles ?

5 - What a magnetic field ?

6 - Are the materials whose atoms have a very incomplete external orbit conducting or insulating ?

7 - Of what is made up the electrical current in a solid driver and a liquid driver ?

8 - Why the negative ions are called anions and the positive ions cations ?

9 - Compared to is the displacement of the electrons, how the conventional direction of the electrical current ?

10 - What intensity of the current in a driver ? Which are its unit and symbol ?

Haut de page Test N° 2

1 - With which unit does measure one the potential and the tension ?

2 - Which are the four essential elements of a pile ?

3 - What the electric resistance of a driver ?

4 - How is the resistance of a driver calculated ? This resistance formulates ?

5 - What does one hear by electric conductance ?

6 - Which are the measuring units of the resistivity and conductivity ?

7 - How state the three forms different from the law of Ohm ?

8 - Which specific characteristics present the connections in series and those in parallel ?

9 - What does one call “f.e.m.” of a pile ?

10 - Why does one connect several piles in series ?

11 - In how much way and how can one calculate the electric output ?

12 - How does one calculate and with which unit one expresses the power consumption by an electrical appliance functioning during a given time ?

13 - What the calorie and how it is defined ?

14 - How does one calculate the quantity of heat in calories when one knows the power consumption in joule to produce it ?

15 - In addition to does its resistive value, which other characteristic have an electric resistance ?

Haut de page Test N° 3

1 - What indicates the electric capacity of a body ?

2 - What indicates the permittivity relating to the air or the vacuum ? Which are its symbol and unit ?

3 - Which is the property first of a condenser ? and for is this reason, how called ? 

4 - Which fraction of the energy provided by a pile to charge a condenser is really stored by this one ?

5 - How does one calculate the energy stored by a condenser? Which is the formula ?

6 - What becomes half of the energy provided by the pile and who is not stored by the condenser ?

7 - When can one say that there is electric field in a given zone ?

8 - How does one calculate the intensity of the existing electric field in the dielectric one of the condenser ?

9 - What indicates the tension of service of a condenser ?

10 - How does one determine the equivalent capacity several condensers connected in parallel ?

11 - How does one determine the equivalent capacity several condensers connected in series ?

12 - Which is the formula for the calculation of two condensers connected in series ?

Haut de page Test N° 4

1 - Of what does consist the magnetic effect of the electrical current ?

2 - How is the magnetomotive force calculated ? Give its formula.

3 - Of what is made up flow of induction ?

4 - How is the inductance of a reel calculated knowing the flow embraced by its whorls and the current which traverses them ? Give its formula.

5 - By which parameter do distinguish we the magnetic capacity from materials ?

6 - Of which parameters is a function the inductance of a reel ? Give the formula of its calculation according to these parameters.

Haut de page Test N° 5

1 - How can we induce a f.e.m. in a whorl ?

2 - Does the value of f.e.m. depend only on the variation of embraced flow ?

3 - How states the Lenz's law ?

4 - Which is the difference between the phenomena of mutual induction and self-induction ?

5 - How does a reel state the law of NEUMANN in the case of ? Give the formula resulting from this law ?

6 - How do we obtain the equivalent inductance of two or several reels connected in series ?

7 - Give the formula of equivalent inductance several reels connected in parallel ?

8 - How do we calculate the electric power stored by a reel ?

 Haut de page Test N° 6

1 - Which is the difference between the AC current and the D.C. current ?

2 - Which pace has a AC current produced by an inductive flow turning ?

3 - With what is used mainly the chart of a AC current ?

4 - What the period of a AC current ?

5 - What indicates the frequency of a AC current and which is its unit ?

6 - How do we find the period of a AC current knowing its frequency ?

7 - What represents the effective value of a AC current and which relation binds this effective value to the maximum value of this current ?

Haut de page Test N° 7

1 - By which value generally does indicate one the alternating voltage ?

2 - In can a capacitive circuit, the D.C. current circulate ?

3 - With what is due the AC current which circulates in a capacitive circuit ?

4 - In a capacitive circuit, which dephasing y-a it between the current and the tension ?

5 - What does one hear by angle of dephasing ?

6 - What the capacitive reactance Teststemxç and how it is calculated ?

7 - In is an inductive circuit, which the sinusoidal size out of phase advances some compared to the other ?

8 - What gives the pulsation w of a current or an alternating voltage ?

9 - How does one calculate inductive reactance XL ?

10 - Which is the measuring unit of the capacitive and inductive reactance ?

Haut de page Test N° 8

1 - How does one name the obstacle which is opposed in the passing of the current in a resistive reel ?

2 - How does one calculate this obstacle knowing resistance R and reactance XL of the reel ?

3 - Which is the measuring unit of the electric impedance ?

4 - Which are the shapes of closed cores usually used ?

5 - Why does one say that a ferromagnetic core is more permeable than the air with the lines of induction ?

6 - What the flow of dispersion ?

7 - What a magnetic circuit ?

8 - What magnetic reluctance ?

9 - How it calculated is ?

10 - When can one say that a core is saturated ?

Haut de page Test N° 9

1 - How are called two rollings up of a transformer ?

2 - Under which conditions a transformer does function it in neutral ?

3 - Can a transformer function with the D.C. current ?

4 - How is the report/ratio of transformation of a transformer obtained ?

5 - Which relation y-a it between the report/ratio of transformation and the number of whorls of rollings up of a transformer ?

6 - What does one hear by universal primary education ?

7 - What the charging current of a transformer ?

8 - Why the core of the transformers is formed small sheets insulated between them ?

9 - What induction ?

10 - Under which conditions the auto-transformer is it particularly more advantageous than the transformer ?

Haut de page Test N° 10

1 - Which effect of the current determines the operation of a galvanometer ?

2 - What does one hear by gauge of a measuring apparatus ?

3 - What does resistance intern of a galvanometer ?

4 - How does one connect a galvanometer to measure the current which circulates in a circuit ?

5 - How does one have to proceed to double the gauge of a galvanometer for the measurement of the current ?

6 - How does one connect a voltmeter to measure the tension at the ends of a resistance ?

7 - How is the value obtained that one must give to the additional resistance of a voltmeter ?

8 - At which end of the dial of an ohmmeter does find one the zero ?

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Daniel