Studyguide .. log (class notes) .. Syllabus User:Guy vandegrift/T/Schedule is under construction. Test 3 is Thursday November 16, 2017 The first listed quiz is a repeat of line integrals. Only one out of 13 questions will be on this quiz. Wikipedia gives the following values for the total body impedance of a hand to hand circuit for dry skin, large contact areas, 50 Hz AC currents (the columns contain the distribution of the impedance in the population percentile; for example at 100 V 50% of the population had an impedance of 1875Ω or less): Another source quotes 500Ω as the resistance of the body, with a skin resistance of 1500Ω. We have alkaline 9V batteries with an internal impedance expected to be 1-2Ω See first wikipedia:Electric Shock, but keep in mind that this is one topic where Wikipedia should not be trusted (it's probably correct but the consequences of being wrong can be grave.) NIH review article by Fish and Geddes pdf Articles by Dalzeil: Electric shock hazard .. [preprint (on voltages) .. Let go currents and voltages. Bernstein: Electrical Shock ... Standards See also my collection from scholarly articles: http://www.learningaboutelectronics.com/Articles/Battery-internal-resistance One 9V battery with a 10W 20-Ohm resistor. Measured voltage was 7.42 volts. Open terminal voltage was 9.26V. Internal resistance is 5.1 ohms. Repeat with same resistor different battery: 7.27 and 8.2 volts: Internal resistance is 2.6 ohms. intro to gauss law: https://www.youtube.com/watch?v=q78oByOGdjk Counting field lines: https://www.colorado.edu/physics/phys1120/phys1120_sm11/lecture-notes/CH21.pdf [[w:special:permalink/806720376#Body_resistance http://www.wright.edu/~guy.vandegrift/wikifiles/Electric%20Shock%20Hazard%20Dalziel.pdf Page 42 http://www.learningaboutelectronics.com/Articles/Battery-internal-resistance
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