TS EAMCET · Physics · Current Electricity
A distribution transformer with an efficiency of \(90 \%\) supplies to a colony of 10 homes. All the 10 homes have electrical oven running at the same time, that draw 20 A current from \(220 \mathrm{~V}\) lines. The power dissipated as heat in the transformer is
- A \(12.2 \mathrm{~kW}\)
- B \(4.9 \mathrm{~kW}\)
- C \(8.4 \mathrm{~kW}\)
- D \(9.9 \mathrm{~kW}\)
Answer & Solution
Correct Answer
(B) \(4.9 \mathrm{~kW}\)
Step-by-step Solution
Detailed explanation
Power consumed by 10 ovens, \[ \begin{aligned} & P=10 \mathrm{VI} \\ & \Rightarrow \text { Voltage, } \quad V=220 \mathrm{~V} \\ & \text { Current, } \quad I=20 \mathrm{~A} \\ & P=10(220 \times 20) \\ & P=44 \times 10^3 \mathrm{~W} \\ & \end{aligned} \] As, efficiency of…
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