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 co…

Question

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

Accepted Answer

Correct answer: B. (b) Here, Efficiency of the transformer, =90 \% Input power, P_ in=3 kW=3 10^3W=3000W Voltage across the primary coil, V_p=200V Current in the secondary coil, I_s=6A As P_ in=I_pV_p Current in the primary coil, I_p= P_ inV_p= 3000W200V=15A Efficiency of the transformer, = P_ outP_ in= V_sI_sV_pI_Y ∴ 90100= 6V_s3000 or V_s= 90 3000100 6=450V

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

Solution

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