Lab%202%20-%20DC%20Circuits

Lab%202%20-%20DC%20Circuits - LAB 2: BASIC DC CIRCUIT...

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LAB 2: BASIC DC CIRCUIT ANALYSIS Resistance It is important to understand how adding components to a circuit will affect the circuit. Resistances placed in series add directly. Resistances placed in parallel add “inversely.” In other words: R T = A + B + C R T = (AB)/(A + B) Voltage Division The voltage drops across resistors in series are directly proportional to the resistances. In other words: V A = V (A) / (A + B + C) V B = V (B) / (A + B + C) Current Division When a current encounters a branch in the circuit, the division of current is inversely proportional to the individual branch resistances. In other words: I A = I T (B) / (A + B) I B = I T (A) / (A + B) Thevenin’s Theorem All circuits, when viewed from the point of a single component, can be simply represented by one voltage source and one resistance. Thevenin’s Voltage (V th ) is the voltage difference between the two terminals of the removed component. Thevenin’s Resistance (R th ) is the resistance between the two terminals of the removed component with all voltage sources shorted. If the removed component is placed in series with V th and R th , the voltage drop across and current through the component will be the same as in the original circuit.
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PRE-LAB 2 1) Draw on the diagram above the direction of current through all wires. 2) What are R t and I t ? 3)
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Lab%202%20-%20DC%20Circuits - LAB 2: BASIC DC CIRCUIT...

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