## Discharge Tubes Demonstrated and discussed

And how does gas pressures determine effects when high voltage is applied across them? Watch the video that was important in the exploration of cathode rays that eventually led to the discovery of the electron by JJ Thomson

## MRI basics: part 2 : alignment and precession

In part 2 of my MRI series, I discuss how an external magnetic field affects the magnetic moment of the hydrogen nucleus. In particular, how it aligns and precession. Both are explained at length in a non technical fashion

## Optics – The physics of the eye (Accommodation)

Want to know how the eye focuses or accommodates? This video goes through the physics of accommodation, how the eye adjusts in order to produce a sharp image on the retina. It also covers long and short sightedness and how to fix them.

## Refraction explained

In this video, I go through refraction using the excellent animation from pHET (http://phet.colorado.edu) I discuss the basics of refraction as well as Snell’s Law.

## Piezoelectric Effect Explained

This video covers how crystals are used to create and receive high frequency sound. Apart from their use in small speakers, they are especially useful in their used of transducers for ultrasound imaging.

## solenoids explained

How do you make a current carrying wire into an electromagnet? This video explains the physics of the solenoid, covering both the shape and size of the magnetic field it generates

## electric field diagrams

What is an electric field? How do you draw them diagrammatically? Watch the video as I explain fields around – single charges – multiple charges – plates

## series and parallel circuits – the math

A follow up of my first video on circuits, this video explores the mathematics. of circuits, with the use of Ohm’s Law to determine resistance, voltage and current, in both series and parallel circuits.

## How a diode works

How do two bits of semiconductor make a diode? In this video, I show you what happens when you put two semiconductors together and how that is able to convert AC to DC

## michelson morley maths

This is an addendum to my Michelson Morley Experiment video It explains the maths behind why they thought the light paths would arrive at different times

## MRI Basics : Part 4 : Relaxation

In part 4 of my 5 part series I discuss how an image is formed from the result of relaxation. I also discuss T1 and T2 weighting and how that proves the image.

## MRI basics: part 5 : Determine Location

In my final part of a 5 part series on MRI, I discuss how the MRI machine uses gradient coils to determine the location of precessing hydrogen atoms. I also do a brief review of all 5 parts