What causes voltage to be induced in a transformer?
If you want to answer this question, I think it will be more helpful for you to understand the working principle of the transformer.
Principle of electromagnetic induction: When the magnetic flux associated with the coil
changes (or we can understand that the magnetic flux passing through or through the coil changes), the coil will induce an electromotive force (electromotive force is a physical quantity used to characterize the power supply, commonly known as current), and when the magnetic flux passing through the coil keeps changing continuously,
this induced electromotive force (induced current) will be generated continuously accordingly. This is the most intuitive explanation of "electromagnetism".
Specifically, according to Faraday's electromagnetic induction principle, the amplitude of the induced electromotive force (induced current) is proportional to the rate of change of the magnetic flux passing through the coil. We can explain this statement more intuitively in a mathematical way, 
, where E is the induced electromotive force, N is the number of turns of the coil, and
is the rate of change of the magnetic flux.
Let's look at mutual inductance: the changing alternating current in the primary coil generates a changing magnetic field, and the changing magnetic field passes through the secondary coil, which induces an electromotive force in the secondary coil, that is, an induced current: EMF. Mutual inductance is a direct result of Faraday's law.
Transformers are the best example of mutual inductance, and we define it as follows: when a changing current in one coil induces an electromotive force (current) in another adjacent coil, the phenomenon that occurs is called mutual inductance (which is what we commonly call "electricity generates magnetism, magnetism generates electricity").
In detail, according to Lenz's law, the current generated by the mutual inductance between two coils is affected by the mutual inductance coefficient (the mutual inductance coefficient (M) quantifies the degree of mutual inductance between the two coils), which is measured in Henry (H) according to electronic data. The mutual inductance of the two coils is the same.
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FAQ
Q: 1. How soon can you delivery the transformer?
A: It depends on the quantity and capacity of the transformer, normally within one month since the date drawing confirmed by buyer.
Q: 2. How long can you provide the quality warranty?
A: 24 months since the date transformer operated.
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