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AP EAMCET20228 Jul 2022Evening ShiftPhysicsCurrent ElectricityActual

A heating element is designed to dissipate 2400 ~W when connected to 240 ~V . The power it dissipates when it is connected to 120 ~V is (Assume that resistance of the filament is constant)

Options

  1. A600 ~W
  2. B1200 ~W
  3. C1800 ~W
  4. D400 ~W

Correct answer

A. 600 ~W

Step-by-step solution

Given, Rated power, P_R=2400 ~W Rated voltage, V_R=240 ~V So, resistance of element, R= V_R^2 P_R ( P= V^2 R )= 240 240 2400 =24 when element is connected across 120 ~V supply dissipated power is, aligned P & = V^2 R = 120 120 24 & =600 ~W aligned

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