A 5-A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is

A 5-A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is

  1. A

    0.2  Ω

  2. B

    5  Ω

  3. C

    0.4  Ω

  4. D

    0.04  Ω

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    Solution:

    Power, P = i2 R

         R=Pi2

    Given, P = 1 W, i = 5 A

        R=152=0.04  Ω

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