ELECTRIC FIELD AND FORCE Markus Artner BG Neunkirchen.

ELECTRIC FIELD AND FORCE

Markus ArtnerBG Neunkirchen

Electric field and forceEducational Pathway


Introduction Short Description:

Students will find out about electric forces in easy set up experiment.

A museums visit will enable students to have an idea of what kind of electric phenomena nature can bring up

Students study phenomena by observing simulations and videos

Age range: 15-16 years old

Context: School, museum

Time required: approx. 5-7 lessons

Connection with the curriculum: electric force, coulombs law, electrostatic phenomena



How can a scrap of paper on a table be lifted without touching it?

The scrap can be lifted by using frictional electricity of a charged ruler

A balloon is prepared as being charged by frictional electricity and attached to the glass of the window. As it stays there some questions will appear:

what kind of force makes the balloon being fixed? Students have to find the similarity to the first experiment

Eliciting Curiosity – pre visit phase 1



What do we know about charge

Who found out characteristics about charged and defined them (historical background)?

Questions Eliciting Activities – pre visit phase 1 Define questions from current knowledge

Material



What kind of forces do we already know? Where do those forces come from?

One of those forces are caused by electric charge: what forces appear with 2 like charges and 2 unlike charges?

What happens to charges in conductive material and what to those in insulators?

Questions Eliciting Activities – pre visit phase 1 Define questions from current knowledge

Material



Pre Visit –Phase 2: Active Investigation – PROPOSE PRELIMINARY EXPLANATION OR HYPOTHESES

How can we set up an easy experiment to measure and compare charge?

Get some ideas from current knowledge: in everyday life anyone knows charges are "produced" by taking off woole textiles or similar.

Find out how to "produce" electric charged objects

Find out forces that appear



Pre Visit –Phase 2: plan simple investigation

Build your own electroscope

Balloon, can and foil Charged balloons

• Using simple devices to explore electric field strenght

• Development of scientific models for measuring



Pre Visit –Phase 2: propose preliminary hypothesis

Identification of possible misconceptions associated to electricity. Some could be:

Electric charged objects attract because of magnetic force: This can easily be disproved by simple experiments Protons move from object to object: Misconception associated to the structure of matter: This would need a deeper repeating of matter-theoryElectric force increases and decreases direct proportionally to distance. This misconception can be used to start investigation by the help of electric field animation



Pre Visit –Phase 2: Observation:

Electric field simulation

• View field line grid

• analyze influence of additional charged particles

• measure forces and strength

• View forces as vector graphs

Animation




Charges and field simulation

• View field line grid

• analyze influence of additional charged particles

• measure forces and strength

• View forces as vector graphs



Pre Visit –Phase 2: Investigation:

How does electric force depend from distance and charge?

• Use of worksheet

• Analyze different charges

• Analyze different distances

• Measure field strenght

• Protocol measurements and report

worksheet




Play electric field hockey Try to reach the goal

Mind the attracting and repelling force

Try to use as less charge as possible

start game

material



Visit - Phase 3Creation – GATHER EVIDENCE FROM OBSERVATION

The high voltage room at the technical museum in Vienna

Observe experiments showing the impact of high voltage electric fields

Observe the tesla coile and emerging flashovers

http://www.tmw.at/default.asp?id=216&al=deutsch



Visit - Phase 3Creation – GATHER EVIDENCE FROM OBSERVATION

Students observe phenomena of high voltage

Students observe emerging flashovers that appear at the tesla coil




Visit - Teaching Phase 4Discussion – Explanation based on evidence

What could be a possible explanation for lightening in nature

The teacher points out that earth and clouds carry a huge amount of charge.

Students discuss how can the charge of clouds be produced.



Visit - Teaching Phase 4Discussion – consider and observe explanations based on animations: moving icy and fluid particles in clouds



How do electric fields take influence on our life

Considering: high voltage lines, electric plugs

What could be an explanation for lightening


Visit - Teaching Phase 4Discussion – Explanation based on evidence



What do we know about electric phenomena in everyday life and how can we know there are electric fields?

Students are asked to make reports of observation Students are enforced to start the coulombe-quiz

How does earths and atmospheres electricity work out?

working out explanations for the phenomena Students work out presentation using material from the web

Discuss presentations and findings

Analyzing – post visit Teaching phase 5: communicate observations and explanations

start quiz

material

ELECTRIC FIELD AND FORCE Markus Artner BG Neunkirchen.

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