Circuits simples, Résistances, Condensateur

Conductors and non-conductors

Measuring range extension of avoltmètre

Principle

A sensitive moving coil galvanometer only has a very small measuring range when it is used directly as a voltmeter. With the aid of this educationally designed instrument, the measuring range can be extended by means of resistors connected in series in front of it.< ...

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 à light bulb

Principle

The behaviour of a filament lamp at the moment it is switched on is to be examined.

Interrupteur-on behaviour of à condensateur

Principle

The behaviour of the current and voltage at a capacitor at the moment it is switched on is determined here.

Generation of an ac-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 ...

The bimetallic switch

Principle

A bi-metal strip comprises two metal strips which are laminated together and have different thermal expansion coefficients. When warmed the strip flexes toward the side with the lower expansion coefficient. In so doing, it can act as a switch in the el ...

Résistance of wires -dependence on length and cross sectio-nal area

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 résistance in à parallel circuit

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

Current and résistance in à series circuit

Principle

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.

Tasks

• Switch an incandescent lamp in se ...

The potentiomètre

Principle

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 ...

éLectrical power and électrical work

Principle

A greater number of lamps means more power than a smaller number of lamps. How much voltage and current do you need for the many lamps? Which conclusions on electrical power and work can you drawn from this?

Tasks

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Charge et décharge d'un condensateur

Principle

Capacitors are devices that can store charge. Here the details of how the charge gets in and out of the capacitor is looked at.

Tasks

Examine the behaviour of the voltage and current of a capacitor during the charg ...