Question 390Electricity & Electronics - QMED

The correct answer is D) No voltage on the output of the secondary coil. An open primary coil in a simple potential transformer will result in no voltage being induced in the secondary coil, as the primary circuit is broken and no current is flowing through it. This lack of induced voltage in the secondary coil is the key indicator of an open primary coil. The other options are incorrect because: A) Low resistance on the primary would not indicate an open circuit, B) An infinite resistance on the secondary is not directly related to an open primary, and C) An overloaded secondary is a separate issue not caused by an open primary.