An electrician is tasked with building a 230 V transformer that will safely and brightly power a 15 V, 1.25 A lamp. Four coils are available: 50, 500, 750, and 1000 turns.
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As shown in this picture.
The number of turns of the two coils must behave with respect to each other, such as the voltages from 230 V input to 15 V output. That’s about 15. This ratio is given only at 750 (primary) and 50 (secondary). These are the two coils. The current in the primary circuit is 1/15 of the voltage in the secondary circuit, i.e. 1,25/15=0.08A
I1/I2 = N2/N1 and U1/U2 = N1/N2
You mean 50 (secondary), right?
Yeah, sorry.
The tensions behave like the turns:
U1/U2 =N1/N2
The secondary winding should be equipped with 50 and the primary winding at 750. There is still a deviation of just under 2%. As a rule, however, the councils can handle it. It is important to take into account the behavior under load, network fluctuations and the line losses.
This means that the values would then relate only to an ideal transformer which has no losses. I think the real transformer will not be the subject of you.
You must first calculate the voltage ratio. This is U1/U2 – 230V/15V
Then you do the same at the windings. As soon as you find the same translation, you have your value.