What system component receives power from the electrical bus in an electrically heated windshield system?

In an electrically heated windshield system, the component that receives power from the electrical bus is the heat control relay. This relay acts as a switch that controls the flow of electricity to the heating elements embedded in the windshield. When the heat control relay is energized, it allows electrical current to pass through the heating elements, which in turn heats the windshield to prevent ice and condensation from forming.

The heat control relay is essential because it not only regulates power but also allows the system to turn on or off based on various conditions, such as pilot input or temperature settings. This ensures efficient use of electrical power while maintaining optimal visibility for the flight crew.

The other components listed, while important in the system's overall function, do not directly receive power from the electrical bus in the same manner as the heat control relay. For example, temperature sensing elements measure the temperature and provide feedback for system adjustments, and thermal switches may protect the system from overheating by interrupting power if necessary. Amplifiers may be involved in signal processing but do not directly interface with power distribution from the electrical bus.