The mosfet is off if the input voltage is normally less than \(2.0 V\). By looking at a circuit diagram ... a voltage divider (consisting of a \(5 kΩ \) resistor and thermistor) and a \(5 V ...
The two resistors may have fixed values or one may be an LDR, a thermistor or other input device. The supply voltage is divided in the ratio of the resistances in the voltage divider. For the ...