Chapter 20/21

20.1 Current
https://cnx.org/contents/JydfSfIS:3ct4v3c5/20.1

20.2 Ohm’s Law: Resistance and Simple Circuits
https://cnx.org/contents/JydfSfIS:yLmi-MuP/20.2

20.3 Resistance and Resistivity
https://cnx.org/contents/JydfSfIS:peIFjTvw/20.3

20.4 Electric Power and Energy
https://cnx.org/contents/JydfSfIS:RJsc91ku/20.4

20.6 Electric Hazards and the Human Body
https://cnx.org/contents/JydfSfIS:P6z4gTAq/20.6
 
20.7 Nerve Conduction–Electrocardiograms
https://cnx.org/contents/JydfSfIS:QfVqqZCo/20.7
 
21.1 Resistors in Series and Parallel
https://cnx.org/contents/JydfSfIS:FLqArfdc/21.1

21.6 DC Circuits Containing Resistors and Capacitors
https://cnx.org/contents/JydfSfIS:v9DiER6B/21.6


19.6 Capacitors in Series and Parallel
https://cnx.org/contents/JydfSfIS:8JBnXbC0/19.6