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Course Electricity and magnetism

Electromagnetic phenomena and their applications
Electric field lines of two opposite charges (dipole)
Level 2 (suitable for students)
Level 2 requires school mathematics. Suitable for pupils.
  1. 1
    Video

    Electric Current explained simply in 7 minutes!

    In this video you will learn the basics of the electric current, i.e. the definition, its physical meaning and unit.⠀

    Content of the video
    1. ⏲ [00:25] Electric charges
    2. ⏲ [02:11] What causes the electric current?
    3. ⏲ [03:42] Formula + unit of electric current
    4. ⏲ [05:43] Is one ampere a large current?
    5. ⏲ [06:44] Summary
    Related formulas
  2. 2
    Video

    Voltage explained simply in 10 minutes!

    Here you will learn what voltage is, how it is generated by charge separation, how a voltage source can be created, and what voltage has to do with current.

    Content of the video
    1. [00:00​] Hello there!
    2. [00:48​] Positive and negative electric charge
    3. [02:00​] Charge separation generates voltage
    4. [03:46​] Voltage is energy per charge
    5. [06:21​] Voltage source and electric current
    6. [08:57] Is voltage dangerous?
  3. 3
    Video

    Ohm's law explained simply in 13 minutes!

    Here you will learn how to recognize Ohm's Law in a U-I diagram and how to apply the associated URI formula. Three examples are covered.

    Content of the video
    1. [00:00] Hello there!
    2. [00:44] The 1st ingredient: Voltage
    3. [01:30] The 2nd ingredient: Electrical conductor
    4. [01:57] The 3rd ingredient: Electric current
    5. [03:28] Data points and Ohm's law as a graph
    6. [05:58] Ohmic conductors
    7. [06:44] Slope of the graph
    8. [07:52] Ohm's law as a formula
    9. [10:10] Electrical resistance
    10. [10:16] Example #1: Resistance unknown
    11. [10:42] Example #2: Voltage unknown
    12. [11:10] Example #3: Current unknown
    Related formulas
  4. 4
    Lesson

    Plate Capacitor: Voltage, Capacitance and Eletric Force

    Here the plate capacitor is simply explained. With the help of the capacitor you will learn about the electric voltage, electric field and electric capacitance and how to calculate them for a plate capacitor.

    Video

    Plate Capacitor explained simply in 7 minutes!

    Here the plate capacitor is simply explained. With the help of the capacitor you will learn about the electric voltage, electric field and electric capacitance and how to calculate them for a plate capacitor.

    Content of the video
    1. ⏲ [00:11] Setup and Applications of a plate capacitor
    2. ⏲ [01:58] Voltage
    3. ⏲ [03:38] Capacitance
    4. ⏲ [04:57] Force on a test charge & Electric field
    Quests with solutions
    Exercise with solution
    Level 2 (suitable for students)

    Create a plate capacitor with a certain capacitance

    In this exercise (with solution) you have to calculate the distance between the capacitor plates for a given capacitance and and than use relative permittivity.

    Exercise with solution
    Level 2 (suitable for students)

    Charge in a thundercloud

    The exercise teaches you how to calculate the charge of a thundercloud using the capacitance and E-field in the plate capacitor.

    Related formulas