A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0​+4t, where ϕ is in weber, t is time in seconds and ϕ0​ is a constant. The output voltage across the secondary coil is

A choke coil of resistance 5 ohm and inductance 0.6 H is in series with a capacitance of 10 muF. If a voltage of 200 V is applied and the frequency is adjusted to resonance , the current and voltage across the inductance and capacitance are I0, V0 and V1, respectively. we have

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A common transistor radio set requires 12V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ......