PHYS 1062 Lecture Notes - Lecture 5: Rc Circuit, Electrical Safety Testing, Short Circuit
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27 (continued: kirchhoff"s rules (section 27-7) rule #1 (junction rule): the current entering any junction point must equal the current leaving. rule #2 (loop rule): the sum of the potential changes around any closed loop is zero. -> short circuit: circuits containing resistor and capacitor (rc circuit) --applications (examples: camera"s flash) (chap. -> rc circuit (capacitor has been charged, without battery)-- discharging a capacitor. Heart pacemakers: the heart contains a pacemaker which sends out tiny electric pulses at rate of 60-80 per minutes. These are the signals that induce the start of each heartbeat. Heart disease: pacemaker-cells fail to function properly and the heart loses its beat. 27 --- 58 [(a) 2. 52 s, (b) 21. 6x10-6 c, (c) 3. 4 s] , 61, 95. Challenging problem: 63 (will not be included in the tests. ) -> magnetic field produced by a magnet; n and s poles. -> magnetic declination (earth: magnetic field produced by a current (sections 29-1 & 29-2)
