Lesson on Static Electricity

Learning intentions

 To be able to explain in scientific terms on the phenomenon of static electricity situation in daily life applications.

Success Criteria

a. state that there are positive and negative charges and that charge is measured in coulombs

b. state that unlike charges attract and like charges repel

c. describe an electric field as a region in which an electric charge experiences a force

1) Introduction - Eliciting Prior Knowledge

Scenario 1

Using a fur like cloth to rub against a balloon or rub against own head, place the balloon near the hair of a student or teacher.

Scenario 2Volunteer a student to hold onto a dog training collar. Teacher passes charges with a press of button to pass mild static electricity and charge the student.

Answering a series of questions, pertaining to the scenario via Goggle form 1.

https://bit.ly/2VDwdhK

2) Eliciting Pre-requisites 

Atomic Structure

Matter is made of atoms which consist of …………………….. (positively charged), ………………

(uncharged) and …………………………(negatively charged).

An atom is ………………….. (electrically balanced) when it has an ……………………. number of protons and electrons.

An atom becomes ………………………. charged if electrons are removed.

An atom becomes …………………… charged if electrons are added.  

Static Electricity

Like charges ……….… and unlike charges………….

Static electricity is defined as the imbalance of electric ……………………….. within or on the surface of a material.

The SI unit of electric charge is the …………………… (C).

Electric charge (Q) , Current (I) ,

Time in seconds (t)

Q  =  I  x t

Materials that give up electrons and gain a positive (+) electrical charge	Materials that attract electrons and gain a negative (-) electrical charge
Dry human skin	Wood
Leather	Hard rubber
Rabbit fur	Nickel, Copper
Glass	Brass, Silver
Human hair	Gold, Platinum
Nylon	Polyester
Wool	Styrene (Styrofoam)
Silk	Cling Film
Aluminum	Polyurethane
Paper	Polyethylene (like Scotch Tape)

Applying understanding and relate to daily application

Scenario 3

Teacher now demonstrates static electricity by rubbing a balloon and use it to ‘attract’ an empty metal can.

Scenario 4

Teacher now demonstrates by rubbing a balloon then places it near a stream of water flow. 

Answering a series of questions, pertaining to the scenario via Goggle form 2.

https://bit.ly/2TfdEDQ

(from 3.18 to 3.58)

(from 1.15 to 3.19)

Electric Field

The ……….………… or ……………….…… force experienced by an electric charge is known as electric force.

 An ………………. ………………. is a region in which an electric charge experiences an electric force.

A ………………. charge has an electric field around it.

Positive point charge

Negative point charge

Strength of an Electric Field is indicated by how …………………. the field lines are to one another.

Electric field strength is………………… near the point charge and decreases ………………………. Away from the point charge.

Files lines of two opposite point charges placed close together

Field lines due to parallel charged plates

Field lines of two positive point charges placed close together

Field lines of two negative point charges placed close together