Np = Number of turns in the primary
Ns = Number of turns in the secondary
Ep = Voltage of primary
Es = Voltage of secondary
Ip = Current in primary
Is = Current in secondary
in general
they wont wind a transformer at 1turn per volt. Instead they use 4Turns per volt for a good trafo.
worst case cheap ones use 2.5turns /V. Such ones core gets dam hot even at 10% loading.
Anyway 476 = 2*2*119
and 100 = 2* 2* 5 * 5
So 120/25.2 = 4.6:1 = 476:100 = 119:25; They are all right, but typically it's expressed in a ratio of integers.
in general
they wont wind a transformer at 1turn per volt. Instead they use 4Turns per volt for a good trafo.
worst case cheap ones use 2.5turns /V. Such ones core gets dam hot even at 10% loading.
I have a Chinese transformer that came with a cheap product. Its output is rated at 9VDC/100mA but is about 19V with no load. It gets very hot even with no load. With a 100mA load its output is its rated 9VDC.
I have a Chinese transformer that came with a cheap product. Its output is rated at 9VDC/100mA but is about 19V with no load. It gets very hot even with no load. With a 100mA load its output is its rated 9VDC.