Computer Interface Cobra4

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 ...

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 ...

Parallel and series connection of helical springs on themagnetic board

Principle

Helical springs can be connected in parallel as well as in series by hanging them alongside each other or one after the other. This experiment is concerned with the resulting spring constants.

Specific heat capacity of water

Principle

Cold water is filled in a calorimeter and heated with a heating coil. The relation between the heating power and the temperature increase and also the specific heat capacity of water are determined.

Specific evaporation heat of water

Principle

Water is filled in a beaker, heated to boiling with a heating coil and partly evaporated. The specific heat of evaporation is determined from the measured heating power and the evaporated mass of water.

Specific heat capacity of liquids

Principle

Glycerol and hot water are mixed in a calorimeter at room temperature and the mixing temperature is measured. The specific heat capacity of glycerol can be determined from the values so obtained and the temperatures of the liquids prior to mixing the ...

Charles' law

Principle

The ideal gas equation describes the thermal state of an enclosed gas with regard to the parameters of state; pressure p, volume V, temperature T and number of gas molecules n. It enables three different gas laws to be derived, each for the behaviour ...

Amontons law

Principle

The ideal gas law describes the thermal state of the gas enclosed in a vessel relative to the properties pressure p, volume V, temperature T, and amount of substance n.  It can be used to derive three different laws which describe how a gas behav ...

Boyle's law

Principle

The general gas equation describes the relationship between pressure, volume and temperature of an enclosed gas volume. A gas syringe is used for measuring the relationship between the volume and the pressure, which is sealed with the help of motor oi ...

Resistance of wires - dependence on the length and cross-section

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.

Current and resistance in a parallel connection

Principle

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.

Tasks