An electrical device operates at 12 A current and 120 V dc. it is connected with 250 V and 30 Hz ac. The power consumption will :

An electrical device operates at 12 A current and 120 V dc. it is connected with 250 V and 30 Hz ac. The power consumption will :

  1. A

    625 W

  2. B

    1250 W

  3. C

    6250 W

  4. D

    zero

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    Solution:

    Resistance of device = 12012=10Ω

    Power consumption = V2rmsR=250210=6250 W

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