# Electrodynamics

Lesson
Level 1 (suitable for all)

## Electric current: How charges flow through a conductor

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

Lesson
Level 2 (suitable for students)

## Ohm's law: Formula, Graph and 3 Easy Examples

Here you learn Ohm's law, how it is expressed as a formula and as a graph. We also look at three examples.

Lesson

## Electromagnetic wave and its E-field and B-field components

Here you will learnthe wave equations for the E-field and B-field of an electromagnetic wave and how it can be simplified to a plane wave.

Lesson
Level 2 (suitable for students)

## 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. Current + time-dependent E-field generate a rotating B-field and vice versa Time changing magnetic field generates a rotating electric field and vice versa Electric flux - scalar product of surface orthogonal vector and E-field
Video

## Maxwells Equations explained extensively in 40 minutes!

The Maxwell’s equations are studied in the second semester of physics. Here you will learn EVERYTHING about them just within 40 minutes - explained for BEGINNERS!

Content of the video
1. ⏲ [00:14] Applications of the Maxwell equations
2. ⏲ [02:08] Electric field vector
3. ⏲ [05:12] Magnetic field vector
4. ⏲ [10:15] Divergence integral theorem - this mathematical theorem combines the volume integral of the divergence of a vector field with the surface integral of this vector field.
5. ⏲ [10:15] Divergence integral theorem - this mathematical theorem combines the volume integral of the divergence of a vector field with the surface integral of this vector field.
6. ⏲ [17:50] Curl integral theorem - this mathematical theorem combines the surface integral of the curl of a vector field with the line integral of this vector field.
7. ⏲ [23:58] The FIRST Maxwell’s equation - states that the charges are sources and sinks of the electric field.
8. ⏲ [27:46] The SECOND Maxwell’s equation - states that magnetic charges always occur as dipoles. There are no magnetic monopoles.
9. ⏲ [30:23] The THIRD Maxwell’ equation (Faraday’s law of induction) - states that a time-varying magnetic field generates an electric field and vice versa. This Maxwell equation contain also the Lenz’s rule.
10. ⏲ [35:02] THE FOURTH Maxwell’s equation - states that the magnetic field can be generated by electric currents and time-varying electric fields (displacement current)
Video
Level 2 (suitable for students)

## 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