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Unformatted text preview: 2. RESISTIVE CIRCUITS CIRCUITS by Ulaby & Maharbiz Piezoresistive sensor 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 Conductivity Tech Brief 4: Resistors As Sensors b Piezoresistive Sensors Tech Brief 4: Resistors As Sensors b Thermistor Sensors Tech Brief 3: Superconductivity b Critical temperature T C is the temperature at which a material becomes superconducting (zero resistance & no power dissipation) Example 21: dc Motor What fraction of power supplied by the battery is dissipated in the motor? Solution: R m = 2 Ω ρ = 1 . 72 × 10 8 Ωm for copper, A = π(d/ 2 ) g G ¡ ¢ ¡ , and d = 2 . 6 mm 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 Planar Circuits b Planar circuits : can be drawn in 2D without branches crossing each other b Whenever possible, redraw circuit to simplify! Kirchhoff’s Current Law Sum of currents entering a node is zero Also holds for closed boundary Kirchhoff’s Voltage Law (KVL) Sum of voltages around a closed path is zero Sum of voltage drops = sum of voltage rises Example 24: KCL/KVL Determine all currents & voltages Solution: Loop 1 Loop 2 Equivalent Circuits...
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This note was uploaded on 01/19/2012 for the course EECS 215 taught by Professor Phillips during the Fall '08 term at University of Michigan.
 Fall '08
 Phillips
 Volt

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