# EM Induction: Increasing Turns, Increasing EMF, Current?

• phyphysics
In summary, there are different factors that affect the current in induction processes. In EM induction, increasing the number of turns in a coil leads to an increase in induced e.m.f and current. However, in operating a transformer, as the voltage of the output current increases, the current actually decreases. This is due to the transformer's current handling ability and the design of the transformer. In motional induction, both the induced e.m.f and current increase, but in mutual induction, only the e.m.f increases. The current in a load is also affected by the transformer's current handling ability, which is limited by the design and can only handle a certain number of watts.
phyphysics
I have a problem:

In EM induction, when we increase the number of turns in a coil, the induced e.m.f will increase, thus the current. Why does the current also increase?

But in operating a transformer, when the voltage of the output current increases, the current decreases. How come? The e.m.f. of the output current becomes larger, isn't it the same case as above that the current would also be increased?

In motional induction, when the induced e.m.f. increases, the current increases. Why does only the e.m.f increase in mutual induction?

Last edited:
The current in a load would increase with increasing EMF, as in a resistor
connect to the transformer.

It's not the current but the transformers's current handling ability
for a fixed power which changes.

An ideal transformer could deliver inifinite current into a short.

A real transformer can only handle a certain number of watts, so the
max current permitted (before metling the wires) is fixed by the design.

Last edited:

## 1. What is EM induction?

EM induction is the process of generating an electric current in a conductor by exposing it to a changing magnetic field. This phenomenon was first discovered by Michael Faraday in the early 19th century.

## 2. How does increasing the number of turns in a coil affect EMF?

Increasing the number of turns in a coil will increase the strength of the magnetic field and, therefore, the induced EMF. This is because the changing magnetic field will cut through more turns of the coil, resulting in a larger EMF.

## 3. Why does increasing the number of turns in a coil increase the EMF?

Increasing the number of turns in a coil increases the EMF because it results in a stronger magnetic field. This stronger magnetic field induces a larger EMF in the coil according to Faraday's law of induction.

## 4. Does increasing the number of turns in a coil always increase the current?

No, increasing the number of turns in a coil does not always increase the current. The current is also dependent on the resistance of the circuit, which can be affected by factors such as the material and thickness of the wire. However, in general, a larger EMF will result in a larger current.

## 5. Are there any other factors besides the number of turns in a coil that can affect EMF and current?

Yes, there are other factors that can affect EMF and current, such as the strength of the magnetic field, the speed at which the magnetic field changes, and the properties of the conductor. Additionally, the presence of other conductors or magnetic materials nearby can also influence EMF and current.

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