MAHE Manipal B.Sc Nursing 2025
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Transformers is considered one the most difficult concept.
23 Questions around this concept.
The core of any transformer is laminated so as to
Step up transformer is used to
Step down transformer is used to
A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating; it is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :
Transformers
It is a device that raises or lowers the voltage in ac circuits through mutual induction. It consists of two coils wound on the same core. The alternating current passing through the primary creates a continuously changing flux through the core. This changing flux induces an alternating emf in the secondary.
Step-up Transformer: A transformer in which the output (secondary) voltage is less than its input (primary) voltage is called a step-down transformer
If
As in an ideal transformer, there is no loss of power i.e.
Hence,
Efficiency of transformer (
For an ideal transformer,
For practical transformer,
So
Losses in transformer: In transformers, some power is always lost due to, heating effect, flux leakage eddy currents, hysteresis and humming.
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