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AP EAMCET202421 May 2024Morning ShiftPhysicsCurrent ElectricityActual

A lamp is rated at 240 ~V , 60 ~W . When in use the resistance of the filament of the lamp is 20 times that of cold filament. The resistance of the lamp when not in use is

Options

  1. A54
  2. B60
  3. C50
  4. D48

Correct answer

D. 48

Step-by-step solution

When the lamp is in use, aligned & R = V ^2 P = 240 240 60 =960 & R =20 R ^ R ^ = R 20 = 960 20 =48 aligned

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