An ideal transformer is one which has

Question

Examoogle · Accepted Answer

No losses and magnetic leakage

Explanation: An ideal transformer is a theoretical model characterized by the absence of all internal losses and imperfections. Specifically, it assumes zero resistance in the windings, zero leakage flux, infinite core permeability, and no hysteresis or eddy current losses.

Working Principle: In an ideal transformer, the entire magnetic flux produced by the primary winding is perfectly linked with the secondary winding. Due to zero resistance and no core losses, the voltage transformation ratio is strictly defined by the turns ratio, ensuring that input power equals output power with no dissipation.

Key Formulas: $V_1 I_1 = V_2 I_2$ — Conservation of power in an ideal transformer; $\frac{V_1}{V_2} = \frac{N_1}{N_2} = \frac{I_2}{I_1}$ — Turns ratio relationship

Key Points: Zero winding resistance ($R_1 = R_2 = 0$); Zero leakage reactance ($X_{l1} = X_{l2} = 0$); Infinite permeability of the core (requires zero magnetizing current); Efficiency is theoretically 100%

Advantages: Simplifies analytical calculations in power system modeling; Provides a baseline for evaluating actual transformer performance

Disadvantages: Physically impossible to construct; Neglects real-world phenomena like core saturation and copper losses

Applications: Theoretical circuit analysis; Educational modeling of power systems; Derivation of transformer equivalent circuits

Additional Info: The concept of an ideal transformer serves as the starting point for developing the equivalent circuit of real-world transformers.. Option C is a feature of most transformers but does not define 'idealness', as real transformers also have cores.. Option D suggests specific materials that do not eliminate electromagnetic losses.

Answer: A is correct — An ideal transformer assumes no internal power losses and complete flux linkage between primary and secondary coils.

Exam Tip: Always remember that in an ideal transformer, the excitation current is zero because the core permeability is assumed to be infinite.

Related Questions

Discussion (0)