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A distribution transformeer with an efficiency of 90% supplies to a colony of 10homes have electrical oven running at the same time, that draw 20 A current from 220 V lines. The power dissipated as heat in the transformer is |
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Answer» `12.2kW` `P = 10 VI` `implies `Voltage , `V= 220V` Current, `I = 20A` `P = 10(220xx 20)` ` P = 44 xx 10^(3) W` As, EFFICIENCY of transformer is `90%` so power dilivered by transformer `implies p '= (100)/(90) xxp = (10)/(9) xx 44 xx 10 ^(3)` `p' =48.9 xx10^(3) W` Power wasted or dissipated as heat Heat, `H = p'-p=(48.9-44)10^(3)` `=4.89KW~~4.9KW` |
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