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Which winding in a transforemer has more number of turns?
Low voltage winding
High voltage winding
Primary winding
Secondary winding
High voltage winding
In an ideal transformer, the induced EMF per turn is constant for both windings. Therefore, to achieve a higher voltage level (V2тАЛ>V1тАЛ), the number of turns (N) in that winding must be proportionally higher, as governed by the transformer EMF equation.
In an ideal transformer, the induced EMF per turn is constant for both windings. Therefore, to achieve a higher voltage level (V2тАЛ>V1тАЛ), the number of turns (N) in that winding must be proportionally higher, as governed by the transformer EMF equation.
V2тАЛV1тАЛтАЛ=N2тАЛN1тАЛтАЛ=a тАФ Transformer Turns Ratio Equation
E=4.44fN╬жmтАЛ тАФ EMF Equation of a Transformer
The principle of transformer action is based on Faraday's Law of Electromagnetic Induction. The induced EMF in a coil is given by E=4.44fN╬жmтАЛ. Since the frequency (f) and the maximum flux (PhimтАЛ) are common to both windings in the core, the ratio of voltage to turns remains constant (V/N=constant), necessitating more turns for higher voltage levels.
The winding with the higher number of turns is always the High Voltage (HV) winding.
The winding with the lower number of turns is always the Low Voltage (LV) winding.
This relationship holds true regardless of whether the transformer is Step-up or Step-down.
Turns ratio defines the magnitude transformation of voltage and current.
Allows efficient power transmission by stepping up voltage.
Enables safe usage of electrical equipment by stepping down voltage.
Core losses (hysteresis and eddy current) increase with higher winding resistance/turns.
Increased copper losses due to larger wire lengths in HV windings.
Power grid transmission and distribution.
Power supplies for electronic devices.
Impedance matching in communication circuits.
| Feature | LV Winding | HV Winding |
|---|---|---|
Voltage Level | Low | High |
Number of Turns | Fewer Turns | More Turns |
In a step-up transformer, the Secondary is the HV winding (more turns).
In a step-down transformer, the Primary is the HV winding (more turns).
Options C and D are incorrect because the primary or secondary designation depends entirely on the direction of power flow, not the number of turns.
B is correct тАФ The winding designed to operate at a higher voltage level necessarily requires a greater number of turns to satisfy the constant flux linkage condition.
Always remember the mnemonic: 'More Voltage = More Turns', regardless of primary or secondary labels.