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The Art of Electronics
current I: Strom - voltage V or sometimes E or EMF (electromotive force): Spannung -
Ch 1 - 1.1 Introduction
p1 - book teaches subject to enable building gadgets doing almost any conceivable task - chapter starts with components which make up electric circuits: voltage, current (Strom), power - can't perceive electricity with sences, abstraction needed and dependence on visualizing instruments, oscilloscopes, voltmeters - minimal math - using some components ahead of time to create apps - after foundations of electronics we get into active circuits (amplifiers, oscillators, logic circuits etc.
1.2 Voltage, current, and resistance - 1.2.1 Voltage and current
are the 2 quantities we like to keep track of in circuits - they usually change with time, or nothing interesting is happening - Voltage (symbol V or sometimes E) between two points is the cost in energy (work done) required to move a unit of positive charge from the more negative point (lower potential) to the more positive point (higher potential); or the energy released when unit charge moves downhill; or what you apply to cause currents to flow; also called potential difference or electromotive force EMF - unit of mesure is volt V, kilovolts kV=103V, millivolts mV=10-3V, microvolts μV=10-6V - a joule (J) of work is done in moving a coulomb (C) of charge through a potential difference of 1 V - (the coulomb is the unit of electric charge, and it equals the charge of approximately 6×1018 electrons.) - current (symbol I) is the rate of flow of electric charge past a pointunit of measure - unit of measure is ampere or amp (A), mA, micro μA, nano nA, pico pA ...
see voltages and currents via oscilloscope -