i. If R1 is replaced by a short circuit. Complete the formula below for the application of KVL at node A. Use the symbols A,B,& C for the voltages at the nodes) KCL at A: (A-100) (A– 20) (А-C) =0A 4 4 ii. What is the Voltage at B if R1, is replaced by a short circuit? 180 V iii. What is the current in R1 if it is replaced by a short circuit? 55 A iv. If Rµ is replaced by an open circuit, write the equation for the application of KCL at A: KCL at A: A 100 4 -34 – 20 + 4-20 -ЗА - =0A 4 v. What is the voltage across R1 if it is replaced by and open circuit? 660 V vi. What value of R1 gives maximum power transfer? 12 Ω vii. What is the power dissiplated in R1 when it has a value to allow maximum power transfer? 9.075 W

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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.