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12th Class Physics Alternating Current / प्रत्यावर्ती धारा Question Bank MCQ - Alternating Currents

  • question_answer
    An alternating supply of 220 V is applied across a circuit with resistance \[22\text{ }\Omega \] and impedance \[\text{44 }\Omega \]. The power dissipated in the circuit is:

    A) 1100 W                        

    B) 550W

    C) 2200 W           

    D) (2200/3) W

    Correct Answer: B

    Solution :

    (b) 550 W Here,                 \[V=220\,V\] Resistance,         \[R=22\,\Omega \] Impedance,        \[Z=44\,\Omega \] Current in circuit, \[l=\frac{V}{Z}=\frac{220\,V}{44\,\Omega }=5\,A\] Power dissipated in the circuit, \[P={{l}^{2}}R={{(5)}^{2}}\times 22=550\,W\]


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