Electricity

RC low-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 ...

Resonant circuit

Principle

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 ...

Parallel resonant circuit

Principle

An alternating current circuit that consists of a coil and a capacitor switched in parallel to each other is called a parallel-resonant circuit. As is known from previous experiments, there is a phase shift between the current and the voltage at a co ...

Series resonant circuit

Principle

An alternating current circuit that consists of a coil and a capacitor switched in series to each other is called a series resonant circuit. As is known from previous experiments, there is a phase shift between the current and the voltage at a coil or ...

Warm-up time of an energy-saving lamp

Principle

How long does it take for an energy saving lamp to reach full brightness? Energy-saving lamps (compactfluorescent lamps) are increasingly replacing customary filament lamps. They have the disadvantage that they need a longer time until their light rea ...

4 Point Method / Measurement of low resistancesOhm's Law

Principle

The resistances of various DC conductors are determined by recording the current / voltage characteristic. The resistivity of metal rods and the contact resistance of connecting cords are calculated.

Tasks

1. To plot the current / voltage ...

Ohm's law with Cobra3

Principle

The electrical resistance of pure metals increases with increasing temperature. The correlation between voltage and current is to be measured using temperature-in- and dependent resistors. Determine the work and power of an incandescent bulb.

Tasks

Wheatstone bridge

Principle

The Wheatstone bridge circuit is used to determine unknown resistances. The total resistance of resistors connected in parallel and in series is measured.

Tasks

1. Determination of unknown resistances. Determina ...

Internal resistance and matching in voltage sources

Temperature dependence of different resistors and diodes with a multimeter

Principle

The temperature dependence of an electrical parameter (e.g. resistance, conducting-state voltage, blocking voltage) of different components is determined. To do this, the immersion probe set is immersed in a water bath and the resistance is measured at regular tempe ...

Temperature dependence of different resistors and diodes with the FG module and Cobra3

Principle

The temperature dependence of an electrical parameter (e.g. resistance, conducting-state voltage, blocking voltage) of different components is determined. To do this, the immersion probe set is immersed in a water bath and the resistance is measured at regu ...

Kirchhoff's laws

Principle

First Kirchhoff's laws are verified by measuring current, voltage and resistance in series and parallel circuits. The Wheatstone bridge circuit is used to determine unknown resistances more precisely.

Tasks

1. ...

Current balance/ force acting on a current-carrying conductor with an amperemeter

Principle

The force acting on a current-carrying conductor loop in a uniform magnetic field (Lorentz force) is measured with a balance. Conductor loops of various sizes are suspended in turn from the balance, and the Lorentz force is determined as a function of the current an ...

Semiconductor thermogenerator

Principle

In a semi-conductor thermogenerator, the no-load voltage and the short-circuit current are measured as a function of the temperature difference. The internal resistance, the Seebeck coefficient and the efficiency are determined.

Tasks

...

Peltier heat pump

Principle

The (cooling capacity) heating capacity and efficiency rating of a Peltier heat pump are determined under different operating conditions.

Tasks

1. To determine the cooling capacity Pc the pump as a function of the current and to calculate ...