Topicm85412553290525c0_1528449000663_0Topic

Electric charges and their interactions. Elementary charge. The interactioninteractioninteraction of charged bodies, Coulomb's law

Levelm85412553290525c0_1528449084556_0Level

Third

Core curriculumm85412553290525c0_1528449076687_0Core curriculum

VI. Electricity. The student:

1) describes methods of electrifying bodies by friction  and contact; indicates that these phenomena rely on the movement of electrons;

2) describes qualitatively the impact of like and unlike charges.

Timingm85412553290525c0_1528449068082_0Timing

45 minutes

General learning objectivesm85412553290525c0_1528449523725_0General learning objectives

Introduction of the concept of electric chargeelectric chargeelectric charge and discussion of its properties.

Key competencesm85412553290525c0_1528449552113_0Key competences

1. Defining the concept of electric charge.

2. Discussion of the electric charge propertiescharge propertiescharge properties.

3. Introduction of the law of interactioninteractioninteraction between charges: Coulomb's law.

Operational (detailed) goalsm85412553290525c0_1528450430307_0Operational (detailed) goals

The student:

- can define and discuss the properties of electric chargeelectric chargeelectric charge.

Methodsm85412553290525c0_1528449534267_0Methods

1. A talk presenting new information.

2. Formulating problems and ideas how to solve them.

Forms of workm85412553290525c0_1528449514617_0Forms of work

1. Work with the e‑book and the Internet.

2. Preparing own notes from lessons and presentation in front of the class.

Lesson stages

Introductionm85412553290525c0_1528450127855_0Introduction

Answer the introductory questions:

1. What is matter made of?

2. Are we dealing with electric charges in the surrounding world (nature)?

3. Do electric charges affect each other?

Procedurem85412553290525c0_1528446435040_0Procedure

Definition of charge.

Charge is a specific property of matter.m85412553290525c0_1527752256679_0Charge is a specific property of matter.

In nature there are two types of electric charges: positive and negative. Like charges repel and unlike charges attract.

Electron is symbolically attributed with elementary negative charge, while proton with positive charge.

The unit of charge in SI system is Coulomb written as 1 C.

The magnitude of the smallest „charge portion”, called the elementary charge, is:

Nowadays, we are aware that elementary components of atoms – electrons and protons,  have exactly this value.

Coulomb's lawCoulomb's lawCoulomb's law:

The force of the interaction between the charges is directly proportional to the product of their magnitude and inversely proportional to the square of the separation between them:

where:
$\overrightarrow{F}$ - the force of interactioninteractioninteraction between charges,
$q_1,q_2$ - the magnitude of charges interacting with each other,
$r$ - separation between charges,
$k$ – electrostatic constant depends on the type of the matter in which the charges are located

Charge propertiescharge propertiesCharge properties:

1. There are two types of charge - positive and negative.
2. Two like charges repel each other and unlike charges attract.
3. Every charge is always total multiple of one the least possible portion of charge called the elementary charge.

[Slideshow]

Lesson summarym85412553290525c0_1528450119332_0Lesson summary

- In nature there are two types of electric charges: positive and negative.
- Charges with the same signs, called like charges, repel each other whereas charges with different signs, called unlike charges, attract.
- A scientific instrument that is used to examine the magnitude of electric charge on a body is called an electroscope.
- An electrically charged body has excess or deficiency of electrons.m85412553290525c0_1527752263647_0- In nature there are two types of electric charges: positive and negative.
- Charges with the same signs, called like charges, repel each other whereas charges with different signs, called unlike charges, attract.
- A scientific instrument that is used to examine the magnitude of electric charge on a body is called an electroscope.
- An electrically charged body has excess or deficiency of electrons.

Selected words and expressions used in the lesson plan

electric chargeelectric chargeelectric charge

interactioninteractioninteraction

charge propertiescharge propertiescharge properties

Coulomb's lawCoulomb's lawCoulomb's law

electroscopeelectroscopeelectroscope