When the windshield temperature is above the calibrated value, what happens to the current flow through the control unit's amplifiers?

When the windshield temperature exceeds the calibrated value, it indicates that the heating elements in the windshield are responding to an increased temperature. In this scenario, the control unit's amplifiers adjust the current flow accordingly to prevent overheating. As a result, the current flow decreases to maintain optimal operating conditions and to avoid potential damage to the windshield heating system. This regulation is crucial for ensuring both the functionality and safety of the system, as it prevents excessive heating from occurring.

The other options do not accurately reflect the mechanism in place for temperature regulation within the control unit's design. Stopping the current flow completely would not allow the system to maintain the necessary level of heating in cooler conditions, while increasing the current flow would exacerbate the heating problem. An erratic behavior in current flow could lead to inconsistent heating and performance issues, which is not how these systems are designed to operate under normal circumstances.