ENGR 111 Lecture 3
Reading: Chapters 19,
Class notes
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Lecture 3: DC Fundamentals
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Electrical Charge (q): more or fewer
electrons
{
In an atom, # of electrons = # of protons
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When they differ, electrical charge is present
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Each electron/proton carries a unit charge
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Electron negative, Proton positive
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More electrons than protons, negatively
charged
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More protons than electrons, positively charged
Electrical Charge
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Unit of Charge: 1 coulomb (1C)
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Equal to charge of 6.24x10^18 elementary
charges
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An electrical (or electrostatic) field
surrounds a charge
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The field strength proportional to charge
{
The field strength inversely proportional to
square of distance from the charge
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Electrical Charge
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Charges of opposite polarity attract
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Charges of similar polarity repel
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Electrical charge can be created through
chemical processes
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Batteries
Electrical fundamentals
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Voltage is the potential difference of charge at
two points in an electrical field
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Voltage symbol V, unit Volts
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Voltage results in the flow of charge between
two points
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- Fall '07
- walker
- Proton, Kirchoff, Electric charge, Electrical charge
-
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