In b the resistor is transversed in the direcbon

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Unformatted text preview: analog. Loop Rule •  A statement of ConservaBon of Energy •  To apply Kirchhoff’s Rules, –  Assign symbols and direcBons to the currents in all branches of the circuit. •  If the direcBon of a current is incorrect, the answer will be negaBve, but have the correct magnitude. –  Choose a direcBon to transverse the loops. •  Record voltage rises and drops. More About the Loop Rule •  Traveling around the loop from a to b •  In a, the resistor is transversed in the direcBon of the current, the potenBal across the resistor is –IR. •  In b, the resistor is transversed in the direcBon opposite of the current, the potenBal across the resistor is +IR. Loop Rule •  In c, the source of emf is transversed in the direcBon of the emf (from – to +), the change in the electric potenBal is +ε •  In d, the source of emf is transversed in the direcBon opposite of the emf (from + to - ), the change in the electric potenBal is - ε JuncBon EquaBons from Kirchhoff’s Rules •  Use the juncBon rule as o\en as needed, so l...
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