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# Electrodynamics

Video
Level 1 (suitable for all)

## 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
Formula

Formula

Formula

## Long coil (magnetic field, number of turns, current)

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.

Exercise with solution
Level 3 (for advanced students)

## Capacitor with and without dielectric in comparison

In this exercise with solution about the plate capacitor, the capacitance, voltage and energy must be compared with and without dielectric.