PPE22_Kirchhoff

# PPE22_Kirchhoff - Current Resistance and Circuits Circuit...

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Current, Resistance, Current, Resistance, and Circuits and Circuits Circuit Elements and Kirchhoff’s Laws © RHJansen

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Electrical Component Symbols © RHJansen Battery Resistor Capacitor Switch Light Bulb L A Ammeter V Voltmeter
Kirchhoff’s Loop Rule The potential difference in a loop of a circuit is zero . The voltage of all the elements of a circuit must add to zero. Based on conservation of energy . If you start at a point, move in any direction or in any manner, and eventually return to the starting point there can be no change in energy or potential. Whenever you return to the starting location final minus initial will always be zero. © RHJansen ∆ς λοοπ = Σ ∆ς ( 29 ι = 0

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Kirchhoff’s Loop Rule In order move and eventually return to the starting conditions an object must move both positively and negatively. Voltage is analogous to height in gravity . Moving upward increases potential and potential energy. Batteries and generators act like charge escalators lifting charges against the natural tendency to fall, and have positive potential . Moving downward decreases potential and potential energy. Electrical components use the energy created by batteries and generators. As the charges fall through the circuit they lose energy to components such as resistors , which have negative potential . © RHJansen
The potential of devices that create a potential difference, such as batteries and generators, is known as electromotive force, emf ( ε ) While batteries are associated with a positive potential difference ( emf ) there are times when a battery may be labeled as having a negative potential difference ( emf ). If a battery is placed in a circuit backwards, then its potential difference ( emf ) is reversed. When there are two or more batteries the positive potential difference (+ ε ) is assigned to the strongest battery , and the negative potential difference (− ε )is assigned to any reversed weaker batteries . © RHJansen

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PPE22_Kirchhoff - Current Resistance and Circuits Circuit...

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