What is the total resistance of the two devices in series in the arrangement described above?

What is the total resistance of the two devices in series in the arrangement described above?

• A. 200 ohms
• B. 240 ohms
• C. 20 ohms
• D. 220 ohms

Answer: (D)

In a series circuit, the total resistance is the sum of the individual resistances because the same current flows through each device and the voltage divides across them. If the two devices have resistances of 200 ohms and 20 ohms, their total is 200 + 20 = 220 ohms. That’s why 220 ohms is the correct total. The other numbers would come from different component values or a different arrangement (for example, a total of 240 would require 200 plus 40, and 200 or 20 would imply only one device contributing to the resistance in that setup).

In a series circuit, the total resistance is the sum of the individual resistances because the same current flows through each device and the voltage divides across them. If the two devices have resistances of 200 ohms and 20 ohms, their total is 200 + 20 = 220 ohms. That’s why 220 ohms is the correct total. The other numbers would come from different component values or a different arrangement (for example, a total of 240 would require 200 plus 40, and 200 or 20 would imply only one device contributing to the resistance in that setup).