If the secondary winding of a transformer is open, what will happen to the secondary resistance?

When the secondary winding of a transformer is open, it means that there is a break in the circuit preventing current from flowing through the secondary side. In this condition, the resistance of the secondary winding effectively becomes infinite. This is because, in an open circuit, no current flows, and resistance is defined as the ratio of voltage to current. Since the current is zero, the mathematical outcome is that resistance approaches infinity.

This condition is indicative of an open circuit scenario where the transformer is unable to deliver any output voltage due to the lack of a complete path for current flow. In practical terms, this means that the transformer cannot perform its intended function of transmitting energy to the load connected to the secondary winding.