Lecture 3 - ENGR 111 Lecture 3 Reading: Chapters 19, Class...

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ENGR 111 Lecture 3 Reading: Chapters 19, Class notes
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Lecture 3: DC Fundamentals l Electrical Charge (q): more or fewer electrons ¡ In an atom, # of electrons = # of protons ¡ When they differ, electrical charge is present ¡ Each electron/proton carries a unit charge l Electron negative, Proton positive ¡ More electrons than protons, negatively charged ¡ More protons than electrons, positively charged
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Electrical Charge l Unit of Charge: 1 coulomb (1C) ¡ Equal to charge of 6.24x10^18 elementary charges l An electrical (or electrostatic) field surrounds a charge ¡ The field strength proportional to charge ¡ The field strength inversely proportional to square of distance from the charge
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Electrical Charge l Charges of opposite polarity attract l Charges of similar polarity repel l Electrical charge can be created through chemical processes ¡ Batteries
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Electrical fundamentals l Voltage is the potential difference of charge at two points in an electrical field l Voltage symbol V, unit Volts l Voltage results in the flow of charge between two points
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Lecture 3 - ENGR 111 Lecture 3 Reading: Chapters 19, Class...

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