:: : : In an iron-core transformer, the magnetic field that is created is essentially contained in the iron core.
12.
Starting with vacuum tubes and ferrite pot-core transformers those ideas are implemented in complementary metal-oxide-semiconductor ( CMOS ) design today.
13.
To power a device with transmission from several feet away would require a very high field intensity, in what is effectively an air core transformer.
14.
This technique works well for problems where the medium is a vacuum or air or some similar material with a air-core inductors and air-core transformers.
15.
They use an iron core transformer to provide a suitable high impedance load to the valve ( s ) while driving a speaker, which is typically 8 Ohms.
16.
These generate the same voltage and current ranges as iron cored transformers, but in much smaller, lighter designs at high frequency ( not the common 50 60 Hz ).
17.
The power supplies needed to power vacuum tube radios resulted in a common trait of tube-type mobile radios : their heavy weight due to the iron-core transformers in the power supplies.
18.
Alcator A was powered by the Bitter Laboratory's 32 MW DC motor-generators and was the first tokamak in the world to use an air-core transformer for ohmic current drive and heating.
19.
The multiple coil type adjusts the current by either varying the number of turns in the coil ( in tap-type transformers ) or by varying the distance between the primary and secondary coils ( in movable coil or movable core transformers ).
