Final answer:
The statement is true; a solid-state controlled expansion valve uses a thermistor to modulate the voltage to a heat motor operated valve, controlling refrigerant flow based on temperature.
Step-by-step explanation:
The statement is True: The solid-state controlled expansion valve does use a thermistor as a sensing element. A thermistor's resistance changes with temperature, which can be measured and converted into a voltage to control a valve. In the context of temperature control systems, such as refrigeration or air conditioning, the resistance of the thermistor will increase or decrease in response to temperature changes. This change in resistance is used to vary the voltage to a heat motor operated valve, which in turn modulates the flow of refrigerant to maintain desired temperatures. This is similar to how a bimetallic strip works in traditional thermostats, exploiting the principle of thermal expansion and contraction, but in the case of a solid-state valve, it's the thermistor's changing resistance that is used for control.