ch7 - Electricity And Electronics Fundamentals TECH 175...

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1 Electricity And Electronics Fundamentals TECH 175 Fall Semester 2007 Chapter 7 Parallel Circuits 3 Parallel Circuits • House circuits contain parallel circuits • The parallel circuit will continue to operate even though one component may be open • Only the open or defective component will no longer continue to operate 4 Parallel Circuits 5 Parallel Circuits • Elements in parallel – When they have exactly two nodes in common • Elements between nodes – Any device like voltage sources, resistors, light bulbs, etc. • Elements connected in parallel – Same voltage across them 6 Parallel Circuits
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2 7 Kirchhoff’s Current Law (KCL) • The algebraic sum of the currents entering and leaving a node is equal to zero = 0 I 8 Kirchhoff’s Current Law (KCL) • Currents entering the node are taken to be positive, leaving are taken to be negative • Sum of currents entering a node is equal to the sum of currents leaving the node = out in I I 9 Kirchhoff’s Current Law (KCL) • An analogy: – When water flows in a pipe, the amount of water entering a point is the amount leaving that point 10 Direction of Current • If unsure of the direction of current through an element, assume a direction • Base further calculations on this assumption
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ch7 - Electricity And Electronics Fundamentals TECH 175...

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