tailieunhanh - Basic Circuit Analysis P2

Strictly speaking, a branch of a circuit is a single component such as a resistor or a source. Occasionally, though, this term is applied to a group of components that carry the same current, especially when they are of the same type. | 30 RESISTANCE CHAP. 2 A battery provides 6 V on open circuit and it provides V when delivering 6 A. What is the internal resistance of the battery . Q A 3-hp automobile electric starter motor operates at 85 percent efficiency from a 12-V battery. What is the battery internal resistance if the battery terminal voltage drops to 10 V when energizing the starter motor . Ans. mil A short circuit across a current source draws 20 A. When the current source has an open circuit across it. the terminal voltage is 600 V. Find the internal resistance of the source. Ans. 30 fl A short circuit across a current source draws 15 A. If a 10-fl resistor across the source draws 13 A what is the internal resistance of the source Ans. 65 fl Chapter 3 Series and Parallel DC Circuits BRANCHES NODES LOOPS MESHES SERIES- AND PARALLEL-CONNECTED COMPONENTS Strictly speaking a branch of a circuit is a single component such as a resistor or a source. Occasionally though this term is applied to a group of components that carry the same current especially when they are of the same type. A node is a connection point between two or more branches. On a circuit diagram a node is sometimes indicated by a dot that may be a solder point in the actual circuit. The node also includes all wires connected to the point. In other words it includes all points at the same potential. If a short circuit connects two nodes these two nodes are equivalent to and in fact are just a single node even if two dots are shown. A loop is any simple closed path in a circuit. A mesh is a loop that does not have a closed path in its interior. No components are inside a mesh. Components are connected in series if they carry the same current. Components are connected in parallel if the same voltage is across them. KIRCHHOFF S VOLTAGE LAW AND SERIES DC CIRCUITS Kirchhoff s voltage law abbreviated KVL has three equivalent versions At any instant around a loop in either a clockwise or .