Copyright Goodheart-Willcox Co., Inc. Chapter Review and Assessment 63 Summary • Series electrical circuits have only one pathway for current fl ow. • The total resistance in a series circuit is equal to the sum of all the individual resistors. (RT = R1 + R2 + R3...) • In a series circuit, the current fl owing in all parts of the circuit is the same. (IT = IR1 = IR2 = IR3...). This formula is known as Kirchhoff’s current law. • A voltage drop or loss is found across any resistive element in an electrical circuit. • The sum of the voltage drops in a series circuit is equal to the applied or source voltage. (ET = ER1 + ER2 + ER3...). This formula is known as Kirchhoff’s voltage law. • With the use of Ohm’s law, Watt’s law, and Kirchhoff’s laws, every electrical quantity can be determined. Review Questions Answer the following questions using the information in this chapter. 1. True or False? Current is the same throughout a series circuit. 2. True or False? Resistance is the same throughout a series circuit. 3. What is a voltage drop? In the following problems: I = current R = resistance E = voltage ER1 = voltage drop across R1 ER2 = voltage drop across R2, etc. Solve for the unknowns. 4. 5. E = 50 V RT = _____ R1 = 50 Ω IT = _____ R2 = 150 Ω ER1 = _____ ER2 = _____ R1 R2 ER1 = 25 V ET = _____ ER2 = 175 V R1 = _____ IT = 0.5 A R2 = _____ RT = _____ R1 R2