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CH1_Problems

# CH1_Problems - Problems 11 A l oop in an electrical circuit...

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11. A loop in an electrical circuit is a closed path starting at a node and proceeding through cir- cuit elements eventually returning to the starting point. 12. Kirchhoff's voltage law (KVL) states that the algebraic sum of the voltages in a loop must equal zero. If th e po sitive polarity of a voltage is encountered first in going around the loop , the voltage carries a plus sign in the sum. On the other hand , if the negative polarity is encoun- tered first, the voltage carries a minus sign. 13. Two elements are in parallel if both ends of one element are directly conn ected to corres pond- ing ends of th e other element. The voltages of parallel elements are identical. 14. The voltage between the ends of an ideal con- ductor is zero regardless of the current flowing through the conductor. All point s in a circuit that are connected by ideal conductor s can be cons ider ed as a single point. 15. An ideal indepe ndent voltage source maintains a specified voltage across its terminals indepen- dent of other elements that are connected to it and of the current flowing through it. 16. For a controlled voltage source, the voltage across the source terminals depend s on other Problems Section 1.1: Overview of Electrical Engineering P1.1. What are four reasons that other engineering student s need to learn the fundamentals of electrical engineering? P1.2. Broadly speaking, what are the two objectives of electrical systems? mmn P1.3. Name eight subdivisions of electrical engi- neenng. P1.4. Write a few paragraphs describing an inter- esting application of electrical engineering in your field. Consult engineering journals and trade magazines such as the IEEE Spectrum , Automotive Engineering, Che mi c al Enginee r- ing, or Civil Engineering for ideas. Problems 35 voltages or currents in the circuit. A voltage- controlled voltage source is a voltage source having a voltage equal to a constant times the voltage across a pair of terminals elsewhere in the network. A current-controlled voltage source is a voltage source having a voltage equal to a constant times the current through some oth er element in the circuit. 17. An ideal indep e ndent current source forces a specified curr e nt to flow through itse lf, indep en- dent of other elements that are connected to it and of the voltage across it. 18. For a controlled current source, the current depends on other voltages or currents in the circuit. A voltage-controlled current source pro- duces a current equal to a constant times the voltage across a pair of terminals e ls e wh e re in the network. A current-controlled current source produces a current equal to a cons tant times the current through s ome other element in the circuit. 19.

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CH1_Problems - Problems 11 A l oop in an electrical circuit...

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