678. (1.1.2.2-2) Consider a series circuit employing two resistors. What is true about the resistance value of the second resistor compared to the first when the voltage drop across the first resistor is one-half the source voltage?

Since the voltage drop across the first resistor is half the source voltage in a series circuit, the voltage drop across the second resistor must also be half the source voltage. Equal voltage drops with identical current imply equal resistance values.