Q20 / 256 · NTA Abhyas (NEET) 2020 · Physics · Current Electricity

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

  • A
    125 W
     
  • B
    100 W
  • C
    80 W
     
  • Correct answer
    D
    64 W
     

Solution

Power = 100 W, Voltage = 200 V

The resistance of bulb = V2P=200×200100=400 Ω  

When the bulb is connected across 160 V,

Current in bulb = 160400 A 

Power consumption = VI=160×160400 = 64 W

Hence, the correct answer is option: 'D'.

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