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

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Infinity Learn · Accepted Answer

Here, Efficiency of the transformer, η$$=90$$%Input power, $$Pin=3$$ kW $$=$$ $$3$$×$$103W=3000$$ WVoltage across the primary coil, $$Vp=200VCurrent$$ in the secondary coil, $$Is=6AAs$$ $$Pin=IpVp$$∴ Current in the primary coil,$$Ip=Pin$$ $$Vp=3000$$ $$W200$$ $$V=15$$ Aη$$=PoutPin=VSIsVpIp$$∴  $$90100=6Vs3000$$ or $$Vs=90$$×$$3000100$$×$$6=450$$ V

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

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