Sharing Voltage While Adding More Resistors in Parallel Consider the (slightly modified) network of resistors, shown below. As in the first Conceptual Journey, first answer each of the questions (a) through (c) below qualitatively with the responses "increases", "decreases", or "remains the same" when comparing the circuit with the switch open (the branch with R, is not included) to the circuit with the switch closed (the branch with R2 is included). R1 Vbat R3 R4

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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.