ElectroMagnetic InductionHard
Question
A transformer is employed to reduce 220V to 11V. The primary draws a current of 5A and the secondary 90A. The efficiency of the transformer is : -
Options
A.20 %
B.40 %
C.70 %
D.90 %
More ElectroMagnetic Induction Questions
A conducting loop is placed in uniform magnetic field with its plane perpendicular to the field. An emf is induced in th...Two identical inductance carry currents that vary with time according to linear laws (as shown in figure). In which of t...Two copper cubes A and B composed of identical insulated plates are suspended from strings in between the pole pieces of...A closed circuit consists of a source of constant emf E and a choke coil of inductance L connected in series. The active...A coil has an inductance of 0.7 henry and is joined in series with a resistance of 220Ω. When the alternating emf o...