Computer Interface Cobra4

Electronystagmography

Principle

Electronystagmography (ENG) is an electrophysiological diagnostic procedure for measuring the movement of the eyes. Several electrodes measure the potential differences that are caused by the eye movements. When looking at a moving, regular, repetiti ...

Water quality - contamination with heavy metals

Principle

Heavy-metal ions may be carried into surface or ground water from mining fields or via the waste water of galvanicor similar production sites. They block the effect of enzymes so that the processes in the metabolism of the organisms that are controlle ...

Thermal insulation

Principle

A quick loss of heat is sometimes not wanted. What can be done to keep the temperature in a vessel
constant?

Tasks

Measure the cooling of hot water in two different environments:

• In a glass b ...

Heating of water

Principle

How depends the time required to heat up water on the amount of water when a defined heating source is available?

Tasks

Heat up various amounts of water with an electric heating coil and measure the time dependence ...

Heating of various liquids

Principle

Do different liquids heat up to the same extent when subject to the same heating?

Tasks

Heat 100 g and 100 ml of water and of glycerol with an electric heating coil and measure the temperature
in dependence o ...

Specific heat capacity of water

Principle

In households, a great amount of energy is used to heat up water - for showers, for washing clothes, for cooking. Exactly how much is necessary for each degree that each mililitre of water is warmed up? How are amount of heat, heat capacity and change ...

Specific heat capacity of metals

Principle

The calorimeter can be used to determinethe heat content of a piece of metal.The heat content can be calculated fromthe mixing temperature that is reachedin the calorimeter.

Tasks

Heat up metal bodies of the same ma ...

Calorimetric temperature measurement

Principle

Calorimetry can also be used to determine the temperature of a hot object that is difficult to measured by any other method, e.g. because it is too hot for the thermometers available. The heatcontent of the object can be calculated from the mixture t ...

Conversion of mechanical energy into internal energy

Principle

Different forms of energy can be converted into each other. Here the potential energy of steel pellets is converted to heat when falling pellets collide.

Tasks

Let the pellets dro ...

Melting and freezing curve of sodium thiosulphate

Principle

How does a temperature curve express the change of state of a substance that occurs when it is heated or cooled?

Tasks

Heat sodium thiosulphate until it melts and let it cool down again. Measure the behaviour of the ...

Evaporation

Principle

Drinks can be cooled by putting the bottle in a moist sock and letting the sock dry. The same process occurs when our bodies are cooled by sweating. The change in temperature that occurs is to be examined in this experiment.

Tasks

Buoyancy in water on the magnetic board (Archimedes' prin-ciple)

Principle

Extensive bodies have the property of weighing less when they are in water than when they are in air, which you notice when you swim, for example. For this reason, even heavy container ships can swim, although a small pebble immediately sinks. In this ...

We investigate our heartbeat - electrocardiography

Principle

The heart is a hollow, muscular organ that comprises several secondary muscles. These secondary muscles contract and relax successively, thus pumping the blood through the heart. These muscle activities can be measured electrically as a whole at the ...

We investigate our muscular power - electromyography

Principle

With the exception of the heart muscle, the contractions of striated muscles can be controlled at will. This characteristic enables the observation of the activities of individual muscle groups. An electromyogram (EMG) can be used to measure (record) ...

We measure our eye movements - electrooculography

Principle

With this experiment, you can find evidence of the electrical activity that is generated during the movement of your eyes. Several electrodes attached to the skin of the face measure all the changes of the electrical voltage that are caused by the mov ...