Resistors K A Connor Mobile Studio Project Center for Mobile HandsOn STEM SMART LIGHTING Engineering Research Center ECSE Department Rensselaer Polytechnic Institute Intro to ECSE Analysis What is a Resistor ID: 773164
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Resistors K. A. ConnorMobile Studio ProjectCenter for Mobile Hands-On STEMSMART LIGHTING Engineering Research CenterECSE DepartmentRensselaer Polytechnic Institute Intro to ECSE Analysis
What is a Resistor? Converts electrical energy to heat.Obeys Ohm’s Law
Examples Incandescent lightbulbToasterHair DryerElectric Space HeaterHair CurlerElectric Stove BurnerHeating Element in an Oven9 September 2015 Photocell Electric Motor Coil Damp Soil, Wood, etc. Salt Water Electrical Components Human Body Fuse
Conductor How Does Copper Behave?9 September 2015
Copper Resistivity is 1.7x10-8 Ω/mLength is 1m, Diameter is 2mm (12 AWG)R = 5.4mΩI = 20A (usual limit for household circuit)Electron density n = 8.46 x 1028 m-3J (current density) = Current/Area = 2.5x107 A/m2J = nev d & e = 1.6 x 10-19 Coulombsvd ≈ 2mm/s 9 September 2015 Snails and slugs travel at speeds that vary from slow ( 0.013 m/s ) to very slow ( 0.0028 m/s ).
How Fast is That? vd ≈ 2mm/s About 7 meters per hourFor the very small currents we will typically use (1 – 20mA), speeds are even smaller!10 September 2015Prov. If you work slowly but constantly, you will succeed better than if you work fast for a short while and do not continue. (Associated with Aesop's fable of "The Tortoise and the Hare.") It also helps if there are 10 29 of you per cubic meter working together.