A ($100\, W$, $200\, V$) bulb is connected to a $160\, V$ power supply. The power consumption would be ............. $W$
AIPMT 1997, Medium
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(a) ${P_{consumed}} = {\left( {\frac{{{V_A}}}{{{V_R}}}} \right)^2} \times {P_R} = \frac{{{{(160)}^2}}}{{{{(200)}^2}}} \times 100$$ = 64\,\,W$
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