United University

Physics Grade 8. Work and power of electric current. Electric current in different media. Collection 1

Course Difficulty Icon Intermediate
Course Type Icon Course
Course Duration Icon 15 hours
Language version

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Course Overview

This section covers the following topics:

  • Series and parallel connection of conductors, and mixed connections

  • Work and power of electric current

  • Joule–Lenz Law

  • Electric heating devices

  • The nature of electric current in solutions and molten electrolytes

  • Faraday’s Law of Electrolysis

  • Electric current in gases

  • Electrical safety when working with devices and appliances

Course Structure

Unit II: Part 2 – Work and Power of Electric Current. Electric Current in Various Media

Lesson Breakdown:

  • Lesson 33:
    Work and Power of Electric Current

    • Review Questions

    • Exercise №33

  • Lesson 34:
    Thermal Effect of Current. Joule–Lenz Law

    • Review Questions

    • Exercise №34

  • Lesson 35:
    Electric Heating Devices. Fuses

    • Review Questions

    • Exercise №35

  • Lesson 36:
    §36. Electric Current in Metals

    • Review Questions

    • Exercise №36

  • Lesson 37:
    Electric Current in Electrolytes

    • Review Questions

    • Exercise №37

  • Lesson 38:
    §38. Applications of Electrolysis

    • Review Questions

    • Exercise №38

  • Lesson 39:
    Electric Current in Gases

    • Review Questions

    • Exercise №39

  • Lesson 40:
    §40. Types of Self-Sustained Gas Discharges

    • Review Questions

  • Summary of Unit II

  • Self-assessment Tasks for Unit II

  • Encyclopedic Page: From Leyden Jars to Supercapacitors

  • Suggested Project Topics

  • Problem-Solving Practice:

    • Unit 1: Thermal Phenomena

    • Unit 2: Electrical Phenomena. Electric Current

  • Appendix

Key Course Outcomes

By the end of the course, students will:

  • Apply formulas for current, voltage, and resistance in series connections when solving problems and performing lab work;

  • Draw and assemble simple electric circuits;

  • Use measuring devices to determine current, voltage, and resistance;

  • Follow safety rules when working with electrical equipment and appliances;

  • Apply Ohm’s Law for a circuit segment;

  • Define and use the physical quantities work and power of electric current, including their units;

  • Use formulas for electric work and power to solve physics problems;

  • Calculate electricity consumption using a household electric meter;

  • Formulate and apply the Joule–Lenz Law in problem-solving;

  • Understand the nature of electric current in metals, solutions, and molten electrolytes;

  • Define and use the concept of electrochemical equivalent and its units;

  • Formulate and apply Faraday’s Law of Electrolysis;

  • Understand the nature of electric current in gases;

  • Distinguish between types of electric discharge in gases;

  • Evaluate safe current parameters for the human body and methods of electrical protection;

  • Appreciate the contributions of prominent scientists to the field of electricity;

  • Recognize the importance of electric energy in everyday life and technology.

Required Skills for Taking This Course

  • Basic computer literacy and device handling;

  • Basic reading and writing skills;

  • Physics knowledge at the 8th-year level of study.

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