Electricity/ Electronics/ Electrostatics

Demonstration of the type of charge on rubbed rods

Principle

The students should see that on rubbing different materials a negative or a positive charging results that can be demonstrated with a neon tube.

Task

What can we demonstrate on rubbed plastic rods? Determine with a ...

Demonstration of the type of charge on films and plates

Principle

The pupils see that two isolators, made of different materials, are differenly charged when rubbed. They are able to determine the type of charge with a neon tube or an "electrical balance". They trace back the charging up to a seperation of charge.

Forces between charged bodies

Principle

The pupils learn that, between two electrically-charged bodies, forces act. These are repelling forces when both bodies are identically electrically charged and forces of attraction when they are oppositely charged.

Task

A model of an electroscope

Principle

The pupils learn how an electroscope works, using a simple model, and are able to demonstrate electrical charges.

Task

We construct an electroscope. Construct a model of an electroscope and test it with electrically ...

The mode of operation of an electroscope

Principle

The pupils should recognize

• that one can demonstrate electrical charging with an electroscope but that the type of charge is not revealed,
• that from the extent of pointer swing the strength of the charge can be inferred,

Electrostatic induction with conductors and non-conductors

Principle

The pupils observe the effect of a force between charged bodies and uncharged conductors and non-conductors and they can explain the observed phenomena. They also observe with two uncharged bodies that forces of electrostatic induction can arise from ...

The effect of a force of electrostatic induction (imagecharge)

Principle

The pupils should learn that between an electrically charged insulator and an uncharged electrical conductor an electrical force of attraction can also arise. The forces are of the same type as those with differently charged insulators but they can on ...

Electrostatic induction with an electroscope

Principle

The students apply their knowledge of electrostatic induction to the electroscope. They recognize why a pointer deflection can appear even as a charged object approaches the electroscope. They can explain the series of events in the electroscope.

A conductor as a capacitor

Principle

The pupils should come to realise that metal objects such as an electroscope, induction plate and Faraday-beaker can store charges and can also transport them. They should observe that the amount of stored charge depends on the size and shape of the b ...

Charge distribution in a Faraday cup

Principle

The pupils observe that when a Faraday-beaker is charged up the charges are located on the outside of the beaker and can only be removed from there. Nevertheless, charges can equally well be applied to the inside as to the outside of the beaker.

Storing of positive and negative charges

Principle

The pupils observe that when a Faraday-beaker is charged up the charges are located on the outside of the beaker and can only be removed from there. Nevertheless, charges can equally well be applied to the inside as to the outside of the beaker.

Charge transport with a pendulum

Principle

The students learn that a metallic pendulum can independently transport charges so that at least one body is partly discharged.
 

Task

A pendulum transports charges. Show that a pendulum can transp ...

The mobility of charges in insulators and conductors

Principle

The pupils learn that in insulators charges are locally bound but in metals, that is conductors, they are free to move.

Task

Can the charges in bodies be shifted? Investigate various different electrically-c ...

Testing conductivity with an electroscope

Principle

The pupils learn how to judge the conductivity of materials using an electroscope.

Task

We identify conductors and non-conductors. Investigate whether various objects are conductive using an electroscope.

...

Discharging by ionisation

Principle

The pupils should learn that electrically-charged bodies can be discharged with the help of a flame.

Task

Discharging with a flame. Investigate how the electrical charge of bodies is influenced by a flame.