Vending machine. After joining a circuit design company, you are asked to design the control circuit of a vending machine that sells a type of bottled soft drink. The vending machine only takes quarters (coins worth 25 cents). The unit price of the drink is 75 cents. After collecting three quarters, the vending mạchine releases a bottle.

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A:

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A:

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A:

Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.