One of my less popular videos involves using a wattmeter to measure the efficiency of an immersion heater. In response to someone's request, I recently wrote it out. Immediately below is the letter I sent to this instructor and further below is the written procedure. I am posting a copy on the vimeo website:

I did this lab for the first time last week with students by just talking them through it and writing things on the board. However, since I have to write it up sooner or later I just wrote...


Continue reading ...