Topic: Be careful with current!

Supplementary material for use in lessons in the group of natural sciences (nature, biology, chemistry, geography, physics), additional classes, science clubs. It can serve as a resource for expanding knowledge, preparing students for science competitions.

Target group

Students of the 7th grade of primary school (physics).

Core curriculum

Grade VII – physics
VI. Electricity. Pupil:
14) describes the role of insulation and overload fuses in the home electricity network and the conditions for the safe use of electricity;

General aim of education

Students exchange the basic principles of safe use of electrical devices.

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• how to use the instruction manual for electrical devices;

• recognize the sign „Do not touch! Electrical device”.

Methods/techniques

• expository

  • talk.

• activating

  • discussion.

• programmed

  • with computer;

  • with e‑textbook.

• practical

  • exercices concerned.

Forms of work

• individual activity;

• activity in pairs;

• activity in groups;

• collective activity.

Teaching aids

• e‑textbook;

• notebook and crayons/felt‑tip pens;

• interactive whiteboard, tablets/computers;

• sheets of gray paper;

• colored paper.

Lesson plan overview

Before classes

• Volunteers get acquainted with the content of the abstract and prepare a knowledge quiz for their colleagues.

Introduction

• The teacher explains the aim of the lesson and together with students determines the success criteria to be achieved.

• The teacher plays the recording of the abstract. Every now and then he stops it, asking the students to tell in their own words what they have just heard. This way, students practice listening comprehension.

Realization

• The teacher uses the text of the abstract for individual work or in pairs, according to the following steps: 1) a sketchy review of the text, 2) asking questions, 3) accurate reading, 4) a summary of individual parts of the text, 5) repeating the content or reading the entire text.

• The students are paired up. Taking advantage of the abstract and knowledge from previous lessons, they complement the table columns by inserting examples of potential threats resulting from: 1) operation of household electrical appliances, 2) use of electrical devices by humans, 3) natural, electrical natural phenomena.

• After a few minutes the teacher asks pupils to create fours that set common examples and write them on blue sheets. In the next stage they meet in eights and the proposals are saved on the poster. Posters are hanging out in the classroom. After the analysis, students create a common list of examples.

• Participants familiarize themselves with the content presented in the interactive illustration. Then the teacher discusses the issues with the students.

Summary

• The teacher asks students to carry out the recommended interactive exercise themselves.

• The students, selected before the lesson, present their knowledge quiz related to the topic of the lesson. The class answers questions. The teacher assesses the activity and involvement of students.

Homework

• Develop a lap book containing issues learned during the lesson and bring your work to the next class.

• Listen to the abstract recording at home. Pay attention to pronunciation, accent and intonation. Learn to pronounce the words learned during the lesson.

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

Be careful with current!

More and more devices around us are powered by electricity. We often find out how important these devices are for us when, for example, we can not take the elevator during power outages or when the battery in our phone is flat. Electrical devices, however, require special attention - especially those that need to be plugged into an electrical outlet. The electricity supply is 230 volts. That's enough for paralysis and to harm our health and even take our lives.

Always follow the safety rules when using electrical devices, both inside and outside the home. Most of these rules are listed in the instruction manual for electrical equipment.

• Before using the electric device, read the instructions and familiarize yourself with it’s safety rules.

• Use the electrical device only when it is fully functional and correctly (according to the instructions) connected to an electrical system.

• When the device is out of order, discontinue use and have it repaired by a service technician or an authorized person. Do not carry out any repairs yourself, because it may cause electric shock.

• If you smell burning after switching on the device, it means it is damaged. Turn them off immediately.

• If you notice that the cable is damaged, for example a metal wire protrudes from the rubber wrap, do not connect the device to the power supply.

• Do not put the electric appliance in water or touch it with wet hands, as it may cause an electric shock.

• Before you remove the plug from the socket, turn the device off. Otherwise, you can damage them and you risk being paralyzed.

There are also many electrical devices outside the house, eg high‑voltage cables and poles, power boxes. There are also rules for the safe use of these devices, which we should know, even though we do not use them directly. There may be a strong discharge between the electrical device and the person who is close enough to such a device, called an electric arc. That's why it's worth remembering a few rules.

• Never climb electrical poles and do not approach broken electrical wires on the ground. If you see someone trying to climb a pole, inform an adult immediately.

• Never enter a transformer station.

• Never underestimate the warning signs on electrical devices. Do not touch the poles and power cords of trains and trams.

If an electric shock occurs, do not touch the person who has suffered it. If there is such a possibility, immediately disconnect from the socket the plug of the device, which electric shock, or wooden, a long object pull the affected person away from the power source. Immediately call for help by calling 112 and accurately describing the situation to the ambulance service.

• When using domestic electrical appliances, be sure to use them as intended and in accordance with the instructions for use.

• Do not touch electrical devices outside the home.

• In the event of an electric shock, call for help and inform an adult.