Topicm515de18c302d7c50_1528449000663_0Topic

The law of conservation of electric charge

Levelm515de18c302d7c50_1528449084556_0Level

Second

Core curriculumm515de18c302d7c50_1528449076687_0Core curriculum

VI. Electricity. The student:

4) describes the displacement of charges in conductors under the influence of external charge (electrostatic induction).

Timingm515de18c302d7c50_1528449068082_0Timing

45 minutes

General learning objectivesm515de18c302d7c50_1528449523725_0General learning objectives

Formulation of the law of charge conservation.

Key competencesm515de18c302d7c50_1528449552113_0Key competences

1. Consolidation of the knowledge about the nature of charge.

2. Formulation of the law of charge conservation.

3. Experimental confirmation of the law of charge conservation.

Operational (detailed) goalsm515de18c302d7c50_1528450430307_0Operational (detailed) goals

The student:

- formulates and applies the law of charge conservationcharge conservationcharge conservation,

- experimentally confirms the law of charge conservation.

Methodsm515de18c302d7c50_1528449534267_0Methods

1. Formulating problems and ideas for solving them.

2. Verification of solution ideas.

Forms of workm515de18c302d7c50_1528449514617_0Forms of work

1. Cooperation in groups to solve problems.

2. Learning by experimenting.

Lesson stages

Introductionm515de18c302d7c50_1528450127855_0Introduction

Prepare answers to introductory questions for the lesson.

- What is the electric charge?

- List the properties of electrical charge.

- List the three methods of charging bodies.

Procedurem515de18c302d7c50_1528446435040_0Procedure

The law of conservation of electric charge is one of the basic laws of nature.

It says that in the isolated system, the total electric charge, which is the algebraic sum of all charges of the system of bodies, does not change.

This means that the electric charge cannot be created or destroyed. You can only cause its displacement from one body to another, thereby causing charging of the bodies.

[Slideshow]

Experiment 1

Perform the above experiment. Check the following research hypothesis: the total chargetotal chargetotal charge of the system is conserved.

Experiment 2

You will need three electroscopes to perform this experiment. Perform an analogous experiment with three electroscopes and also show that the total charge of the system is conserved. Repeat the experiment with different electroscopes systems connected by conductors.m515de18c302d7c50_1527752256679_0You will need three electroscopes to perform this experiment. Perform an analogous experiment with three electroscopes and also show that the total charge of the system is conserved. Repeat the experiment with different electroscopes systems connected by conductors.

Lesson summarym515de18c302d7c50_1528450119332_0Lesson summary

- Electric charges cannot be destroyed nor can be created - they can only move.

- In electrically isolated systems, the total electric charge (algebraic sum of positive and negative charges) does not change.

The two above statements are independent formulations of the law of charge conservationcharge conservationcharge conservation; each of them underlines a different aspect of this law.

The electrically isolated systemisolated systemisolated system is a system in which the charge is not exchanged with the surroundings.

The principle of charge conservation allows to explain the course of many phenomena, which include charging bodies (by friction, contact and induction), principles governing the flow of electric current (Kirchhoff's first law) and many phenomena in the micro world, e.g. nuclear reactions.m515de18c302d7c50_1527752263647_0The principle of charge conservation allows to explain the course of many phenomena, which include charging bodies (by friction, contact and induction), principles governing the flow of electric current (Kirchhoff's first law) and many phenomena in the micro world, e.g. nuclear reactions.

Selected words and expressions used in the lesson plan

charge conservationcharge conservationcharge conservation

total chargetotal chargetotal charge

isolated systemisolated systemisolated system

conservation lawconservation lawconservation law

electroscopeelectroscopeelectroscope