EM Induction: Increasing Turns, Increasing EMF, Current?

  • Thread starter Thread starter phyphysics
  • Start date Start date
  • Tags Tags
    Em Induction
Click For Summary
SUMMARY

In electromagnetic (EM) induction, increasing the number of turns in a coil results in a proportional increase in the induced electromotive force (e.m.f.) and current. However, in transformers, an increase in output voltage leads to a decrease in current due to the fixed power handling capacity of the transformer. The current handling ability of a transformer is limited by its design, which dictates the maximum current before overheating occurs. Understanding these principles is crucial for effectively utilizing transformers and coils in electrical applications.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with transformer operation and design
  • Knowledge of Ohm's Law and power calculations
  • Basic concepts of e.m.f. and current relationships
NEXT STEPS
  • Study the principles of electromagnetic induction in detail
  • Learn about transformer design and efficiency factors
  • Explore the relationship between voltage, current, and power in electrical circuits
  • Investigate real-world applications of transformers in power distribution
USEFUL FOR

Electrical engineers, physics students, and professionals involved in power systems and transformer design will benefit from this discussion.

phyphysics
Messages
25
Reaction score
0
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:
Physics news on Phys.org
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:

Similar threads

Replies
1
Views
2K
Replies
5
Views
2K
Replies
7
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
Replies
2
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 9 ·
Replies
9
Views
4K
Replies
11
Views
4K
  • · Replies 2 ·
Replies
2
Views
3K