Evan's Space

Wonders of Physics

Leave a comment

DC motor and AC generator (revised)

The purpose of the split ring commutator and slip rings are updated here.

DC motor and AC generator small


Leave a comment

Different kind of sounds

Students tend to think that ultrasound is a totally different kind of wave, or it is part of the electromagnetic spectrum, which is wrong!

The different kind of waves below are just different kind of sounds. So the properties of sound apply to all. Ultrasound is also sound wave, just that the frequency is greater than 20 kHz which is outside the range of audible frequencies for us.

different type of sounds