EMT 1150 Notes 19 - Chapter 6 summary PDF

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EMT 1150 NOTES (ELECTRICAL CIRCUITS) PARALLEL DC CIRCUITS 6.3 PARALLEL CIRCUITS Through connecting a supply through a series of parallel resistors, a parallel circuit can now be created. The supply's positive terminal is connected directly to the top of each resistor, while each resistor's negative terminal is connected to the bottom. It should be quite obvious therefore that the voltage applied is the same across each resistor. The voltage is always the same over parallel components in general. If there are two parallel components, the voltage must be the same between them. If the voltage between two adjacent elements is the same, though, the two elements may or may not be in parallel. The direction for the currents is determined by the voltage polarity through the resistors. By simply taking the equation for the total resistance, the relation between the source current and the parallel resistor currents can be obtained. The source current (Is) for single source parallel networks is always equal to the sum of the actual branch currents. The source current is the sum of the branch currents for a parallel circuit, while the applied voltage is the sum of the

voltage drops for a series circuit. For parallel resistors, the segment with the least resistor will have the highest current. Current still looks for the least resistance route....