Electricity

The shunt motor

Principle

When electric motors with a higher performance are required, they are generally constructed with electromagnets instead of permanent magnets, as above all these can generate stronger magnetic fields.
In a shunt motor, the armature coil and ...

Bridge rectifiers

Principle

Rectifying circuits with a single diode can only utilize one half wave of alternating current. The bridge rectifier solves this problem by having four diodes connected such that a current path is open for each halfwave.

Tasks

The simple circuit

Ohm's law

Series and parallel connection of solar cells - open-circuit voltage and short-circuit current

Principle

Series or parallel connection of solar cells can be used to change voltage and current and to adjust them to the consumer's needs. The short-circuit current of solar cells is proportional to the irradiance, while their voltage output is nearly independent of it. ...

The transistor as a switch

Principle

The demonstration experiment shows that a transistor can be used as a non-contact electronic switch. The students set up the same experiment with the corresponding elements.

The PEM solar hydrogen model

Principle

Electrical energy from solar cells supplies an electrolyser. The gases generated by the PEM electrolyser - hydrogen and oxygen - are sent directly to the PEM fuel cell. The electrical energy generated is used to drive a small motor. The solar cells can be ...

The light-sensitive switch

The shunt motor

Principle

In a shunt-wound motor the armature and field windings are connected in parallel. The field coils are permanently mounted to components, the motor is screwed to the wall bracket and placed under the field coils. Electrical connection is made via connec ...

The PTC resistor

Ohm's law

Principle

Our objective in this experiment is to find the connection between electric direct voltage and the direct current that it causes. Ohm's law will be verified and the values of the different resistors will be determined from the experimental results.

Self-induction

Principle

How is it possible, that the fuel / air mixture of a spark ignition engine can be ignited by a voltage of up to 30,000 V, but the car battery only supplies 12 V? We will get to the bottom of this phenomenon in this experiment. When the magnetic field ...

Capacitor in the alternating current circuit

Principle

A capacitor fitted in a direct current circuit has an infinitely large ohmic resistance so no current is measurable.
In an alternating current circuit, however, a capacitor behaves completely differently. The resistance of it is finite and a cu ...

A coil in an alternating current circuit

Principle

A coil in a direct current circuit has an ohmic resistance because of the wire. In an alternating current circuit, however, it has an additional resistance alongside the ohmic resistance, the so-called inductive reactance. This experiment deals with w ...

RC high-pass filter

Principle

How does an equalizer function? Equalizers are used in sound engineering to improve tone in stereo systems and in audio computer software, for example. Their basic effect is to weaken certain frequencies of a signal and so to optimize the acoustic con ...