Électrique/ Électronique

Visualisation du champ magnétique d'une bobine

Principle

Current-carrying coils have a magnetic field around them which resembles that of a bar magnet. Inside the coil, the magnetic field lines are parallel to the axis of the coil. The direction of the field depends on the direction of the current in the coil. The magneti ...

The forces between the primary and secondary coils

Principle

This experiment demonstrates the force on a closed conductor in which current is being induced. Using DC in the primary coil, there is a pulse as the power is turned on and the coil is forced away. Using AC, the coil hovers over the primary coil.

Model of a high voltage long distance line

Principle

When electrical energy is transmitted over long distances, it is unavoidable that there will be losses due to resistance in the lines. Using transformer stations and high-voltage transmission lines can drastically reduce such losses. To model such lines, two wires o ...

Self maintained discharge of gases in the discharge tu-be,pohl type

Principle

A gas discharge tube is connected to a vacuum pump. Applying a high voltage causes a variety of light phenomena in the tube, which are dependent on the pressure at that moment. The 0...10-kV high-voltage power supply used here (13670-93) is particularly appropriate ...

Barkhausen effect,Weiss domains

Conductors and non-conductors

Measuring range extension of avoltmètre

Principle

A sensitive moving coil galvanometer only has a very small measuring range when it is used directly as a voltmeter. With the aid of this educationally designed instrument, the measuring range can be extended by means of resistors connected in series in front of it.< ...

Galvanometer

Principle

This galvanometer kit can be used to demonstrate to students the principle design features and functioning of a galvanometer.

Current-carrying conductors in magnetic fields

Principle

If a current-carrying conductor is inside a magnetic field produced by a magnet, then there will be an interaction between the two magnetic fields, whereby both the magnet and the conductor will exert forces on one another.

The principles of working of an électric moteur

Principle

Students will construct various different motor designs using the motor model kit. Using a bar magnet on the model turns it into a DC motor with a direction of rotation dependent on the direction of the current. If an electromagnet is used for the stator field, as s ...

Est 3.3 Effets d'influence sur l'électroscope

Principle

The students apply their knowledge of electrostatic induction to the electroscope. They recognize why a pointer deflection can appear even as a charged object approaches the electroscope. They can explain the series of events in the electroscope.

Dependence of the Lorentz force on the current intensity, conductor length and field direction

Principle

The Lorentz force acting on a straight conductor in a magnetic field is proportional to the current and to the length of the conductor. The direction of the force is determined by the direction of the current and the direction of the magnetic field (right-ha ...

Definition of the magnetic flux density with Cobra4

Principle

Magnetism is a phenomenon that can be attributed to electromagnetic interaction. It manifests itself through the force that acts on magnetisable material and moving electric charges. The force is hereby conveyed via a magnetic field. Measurement is ma ...

La densité de flux magnétique en fonction du courant