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Download Engineering Review – Electric Circuits I
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OHMS LAW V = Voltage, I = Currect, R = Resistance of in a circuit V=I*R Power: π½π π·ππππ = π° β π½ = = π°π β πΉ πΉ RESISTORS β’ Combining resistances in series: πΉππ = πΉπ + πΉπ β¦ + πΉπ β’ Combining resistances in parallel: πΉππ = π π π π + +β― πΉπ πΉπ πΉπ CAPACITORS β’ Combining capacitors in series: β’ πͺππ = β’ Combining capacitors in parallel: πͺππ = πͺπ + πͺπ β¦ + πͺπ β’ Charge on a capacitor: π π π π + +β― πͺπ πͺπ πͺπ Charge = Q =C*V C = Capacitance, V = Voltage Across the capacitor INDUCTORS β’ Inductors in series: π³ππ = π³π + π³π + β― π³π β’ Inductors in parrellel: π³ππ = π π π π + +β― π³π π³π π³π KIRCHOFFβS CURRENT LAW (FOR NODES) π°ππ = β’ π°πππ This can be applied to a node to determine the current in a leg of the other legs are know, by summing the currents in and out of the node. KIRCHOFFβS VOLTAGE LAW π½πππππ = β’ π½π ππππ This means that in any loop of a circuit, the sum of the voltage sources is equal to the voltage drops caused by the loads.