Search results

Mostly for when constant, non-invasive monitering is required, such as during surgery for a patient under anaesthetics (so you know if they suddenly stop breathing, etc)

Enantiostasis is the maintenance of metabolic and physiological functions in response to local environmental changes. 1 - Crabs burrow into the sand/seabed/mud, which protects them from the fluctuating flow of salty water because salinity in the mud is more constant. 2 - Molluscs can close...

Back EMF = voltage Eddy current = current When you have relatively movement between a conductor and a field, back emf is induced. Eddy currents are formed based on the back emf (which is based on the speed of movement) and the resistance of the circuit, ie. V=IR

Cool notes, but I noticed an error. Step-up motors have a greater voltage at secondary coils then at the primary, vice versa for current, and also vice versa for step-down. You have it the other way around for both.

jenii -> jaycar sells rods for $1-$2, that's where everyone is getting them from. They also have little flat bars, but i got a few and they done seem to work as well. Also, get a 6V battery (teh square ones for torches)

Its almost impossible to get the electromagnets strong enough to work. I used a whole spool (~70m) of 0.2mm enamel copper wire on 2 soft iron cores and it's about 1/20 the strength of my permanent magnet. And I only just got it working with my permanent magnets. I'm gonna talk to my science...

I'm doing the 'make your own dc motor in class' prac, and I need an electromagnet, about 50x30mm -ish in cross-section. What should I use for the core? Or should I just make the armature smaller so I can use a smaller electromagnet?