A temperature-monitoring potential divider circuit is designed to turn on a heating element when the surrounding temperature drops. The circuit requires an NTC (negative temperature coefficient) thermistor as the sensing component.
Which symbol represents the thermistor, and what happens to its resistance as the surrounding temperature decreases?
Symbol X\text{X}X, and its resistance increases
Symbol W\text{W}W, and its resistance decreases
Symbol W\text{W}W, and its resistance increases
Symbol Y\text{Y}Y, and its resistance decreases