DC circuit equations and laws
Ohm's and Joule's Laws
NOTE: the symbol "V" is sometimes used to
represent voltage instead of "E". In some cases, an author
or circuit designer may choose to exclusively use "V" for
voltage, never using the symbol "E." Other times the two
symbols are used interchangeably, or "E" is used to
represent voltage from a power source while "V" is used to
represent voltage across a load (voltage "drop").
Kirchhoff's Laws
"The algebraic sum of all voltages in a
loop must equal zero."
Kirchhoff's Voltage Law (KVL)
"The algebraic sum of all currents
entering and exiting a node must equal zero."
Kirchhoff's Current Law (KCL)
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