![]() The final circuit should be straightforward series or parallel circuit, which can be analyzed in the normal way. Repeat procedures 2 and 3 until the desired level of simplification is achieved.Convert all parallel combinations of two or more resistors into a single equivalent resistance.Convert all series branches of two or more resistors into a single equivalent resistance.Draw a circuit diagram identifying all components by number and showing all currents and resistor voltage drops.Obviously, the current through R 1 is now greater than normal, and again power dissipation might present a problem.įig.9: Short-Circuit Across Resistor R 3 Analyzing a Series-Parallel CircuitĪnalysis procedure for series-parallel resistor circuits is as follow: The short-circuit condition illustrated in figure 9 effectively reduces I 2 and I 3 to zero and increases the supply current to This could cause excessive power dissipation in the components if they have previously been operating near their maximum rating.Ī short-circuit in one branch of a series-parallel circuit usually alters the current levels in several branches of the circuit. It is seen that the levels of current through R 2 and R 3 have been increased from the normal (before the short-circuit) condition. Therefore, the supply voltage appears across R 2 and R 3 in parallel. The current through R 1 and R 2 is now equal to the supply current and is calculated asĪlso, because there is no current through R 3, there is no voltage drop across it, and the voltage at the open circuit is equal to V 2.įor the short circuit condition shown in figure 8, the resistance between the terminals of R 1 is effectively zero. In the case of an open-circuit at one end of the parallel resistors, as shown in figure 7, I 2 goes to zero. ![]() Also, because the currents are zero, there are no voltage drops across resistors, and consequently all of the supply voltage E appears across the open-circuit.Īn open-circuit in one branch of a series-parallel circuit usually alters the current levels in several branches of the circuit. This has the same effect as an open-circuit in the supply line so that all current levels are zero. Consider figure 6, where an open-circuit is shown at the end of R 1. The effect of an open-circuit or short-circuit condition on a series-parallel circuit depends on just where in the circuit the fault occurs. ![]() \ Open-Circuit and Short-circuit in a Series-Parallel Circuit You May Also Read: Series Circuit Definition
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