Assertion (A): A hot wire ammeter has a square of the RMS current. Reason (R): The heat is proportional to the square of the current.

Assertion (A): A hot wire ammeter has a square of the RMS current. Reason (R): The heat is proportional to the square of the current. Correct Answer Both A and R are true and R is correct explanation of A

  • The current to be measured is passed through a fine platinum-iridium wire
  • The wire is stretched between two terminals
  • The expansion is proportional to the heating effect of the current and hence to be the square of the RMS value of the current
  • The heating effect is proportional to the square of the current

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