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Principle
The resistance of a short thick wire is different to that of a long thin one.
Tasks
Examine how the value of the resistance of a wire depends on its length and cross-sectional area.
In households, electrical devices are often connected in parallel to different sockets of the same electric circuit. The total current and the total resistance of the circuit can be predicted from the partial resistances.
Various components in a circuit can be connected in series. The total resistance and the total current can be calculated from the partial resistances of the components.
Many controls on electrical devices are potentiometers. A potentiometer acts as a voltage divider. It corresponds to a series connection of two variable resistors with a centre tap, whereby the sum of the resistance of the two resistors remains consta ...
Capacitors are devices that can store charge. Here the details of how the charge gets in and out of the capacitor is looked at.
Examine the behaviour of the voltage and current of a capacitor during the charg ...
A diode only allows electric current to pass in one direction and blocks the other one to the current. It therefore acts as an electric valve. This enables alternating current to also be usable to pump charge into a capacitor.
Tasks< ...
A diode only allows current to flow in one direction and blocks the flow of itin the other direction. So the current can flow only during a half wave through a diode in an alternating current circuit.
Measure ...
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.
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.
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 ...
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 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 ...
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 ...
An oscillating circuit consists mainly of a coil and a capacitor. In this experiment, a close examination of the behaviour of the voltage and the current in an oscillating circuit is to be undertaken and the intrinsic angular frequency is to be deter ...
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