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CircuitTypes - Circuit Types DC Circuits Identifying...

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Circuit Types DC Circuits Identifying features: o Constant inputs: the voltages of independent voltage sources and currents of independent current sources are all constant. o The circuit does not contain any switches. All voltages and currents in a dc circuit are constant. Capacitors act like open circuits and inductors act like short circuits. Example: Determine the current, , and voltage, ( ) i t ( ) v t , for this circuit. Solution: This is a dc circuit so the capacitor acts like an open circuit. The capacitor voltage, , is the voltage across that open circuit. The inductor acts like a short circuit. The inductor current, ( ) v t ( ) i t , is the current in that short circuit. Here’s the circuit after replacing the capacitor by an open circuit and replacing the inductor by a short circuit: Ohm’s law gives ( ) 30 2.5 A 8 4 i t = = + and ( ) ( ) ( ) 4 4 2.5 10 v t i t = = = V 1
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