Electricity

The Hall voltage as a function of the current intensity and magnetic flux density

Field distribution and field strength in the area around a straight conductor

Principle

The magnetic flux density in the field of a straight conductor is inversely proportional to the distance from the conductor. In the experimental set-up pictured here, a high-current transformer generates an alternating current of approximately 100 A, which flows ...

Ferromagnetism, paramagnetism and diamagnetism

Principle

A nickel, tungsten or bismuth rod is brought between the faces of pole pieces 06493-00, attached to U-shaped magnet 06320-00. Rods made of paramagnetic or ferromagnetic materials align themselves parallel to the lines of the magnetic field, whereas ones made of ...

Determination of the permeability of iron

Principle

Magnetic hysteresis is a non-linear relationship between magnetic flux density B and magnetic field strength H. Characteristic properties of a ferromagnetic material can be determined from the hysteresis loop.

The law of induction for sinusoidal alternating fields

Principle

The voltage induced is proportional to the number of windings and to the surface area of the induction coil. For sinusoidal alternating fields, it is also proportional to the current and to the frequency of the current generating the field.

The electric field strength of a plate capacitor

The potential field of an electrically charged sphere

Principle

The potential measurement probe and the electric field meter can be used to study the equipotential lines around a charged sphere. When held in the radial clamp fixture, the probe can be conveniently swivelled into position along circles around the centre o ...

Waltenhofen Pendulum

Principle

When a massive body made of conductive material moves through a magnetic field, eddy currents are induced. According to Lenz’s law, the body is then subjected to a force which is opposed to the cause of the eddy currents, i.e. the motion of the pendulum. The b ...

Rotary motion by turbulent flow - principle of the alternating current meter

Principle

A metal disc rotates on a bearing-mounted shaft in the presence to two out-of-phase alternating magnetic fields. Eddy currents are induced in the disc and forces are imparted onto this current-carrying conductor. Out-of-phase alternating fields also cause the r ...

PEM fuel cell

Principle

PEM (proton exchange membrane) technology refers to the type of fuel cell favoured by car makers and companies that build combined heat and power plants. The demonstration set-up depicted here produces hydrogen using the classic method by reacting hydrochlori ...

Ohm's law

Principle

The connection between electrical voltage and the resulting current is measured with various test resistors.The quotient of voltage and current is a constant value that characterises the component.

Ohm's law

Principle

The connection between electrical voltage and the resulting current is measured with various test resistors.The quotient of voltage and current is a constant value that characterises the component.

Inrush current of a light bulb

Principle

The behaviour of a filament lamp at the moment it is switched on is to be examined.

Switch-on behaviour of a capacitance

Principle

The behaviour of the current and voltage at a capacitor at the moment it is switched on is determined here.

Generation of an alternating voltage, rectification and smoothing

Principle

An alternating voltage is induced in acoil in the (alternating) field of a periodically moving magnet. The characteristic of a diode to allow electric current only to pass in one direction is used to rectify the induced alternating voltage. A capacito ...