215%2BCh2Student - Piezoresistive sensor 2 RESISTIVE...

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2. RESISTIVE CIRCUITS CIRCUITS by Ulaby & Maharbiz Piezoresistive sensor
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Ohm’s Law Voltage across resistor is proportional to current iR = υ Resistance: ability to resist flow of electric current i R υ = ρ = resistivity
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Conductivity
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Tech Brief 4: Resistors As Sensors box2 Piezoresistive Sensors
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Tech Brief 4: Resistors As Sensors box2 Thermistor Sensors
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Tech Brief 3: Superconductivity box2 Critical temperature T C is the temperature at which a material becomes superconducting (zero resistance & no power dissipation)
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Example 2-1: dc Motor What fraction of power supplied by the battery is dissipated in the motor? Solution: R m = 2 ρ = 1 . 72 × 10 - 8 -m for copper, A = π(d/ 2 ) g4666 g3031 g2870 g4667 g2870 , and d = 2 . 6 mm
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Circuit Topology Branch : single element, such as a resistor or source Node : connection point between two or more branches Extraordinary Node : connection point between at least 3 branches Loop : closed path in a circuit node branch loop
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Planar Circuits box2 Planar circuits : can be drawn in 2-D without branches crossing each other box2 Whenever possible, re-draw circuit to simplify!
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Kirchhoff’s Current Law Sum of currents entering a node is zero Also holds for closed boundary
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Kirchhoff’s Voltage Law (KVL) Sum of voltages around a closed path is zero Sum of voltage drops = sum of voltage rises
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Example 2-4: KCL/KVL Determine all currents & voltages Solution: Loop 1 Loop 2
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