In a series circuit, adding another resistor causes the total resistance to:

In a series circuit, adding another resistor causes the total resistance to:

• A. Increase
• B. Decrease
• C. Stay the same
• D. Double

Answer: (A)

In a series circuit, resistances add together to form the total resistance. When you place another resistor in series, you’re adding its resistance to what’s already there, so the overall resistance becomes larger. With a fixed voltage, this higher total resistance also means the current decreases, but the key point for the question is that the total resistance increases when another resistor is added in series. It wouldn’t stay the same or decrease, and doubling would only happen if the new resistor happened to equal the existing total, which isn’t required by the basic rule.

In a series circuit, resistances add together to form the total resistance. When you place another resistor in series, you’re adding its resistance to what’s already there, so the overall resistance becomes larger. With a fixed voltage, this higher total resistance also means the current decreases, but the key point for the question is that the total resistance increases when another resistor is added in series. It wouldn’t stay the same or decrease, and doubling would only happen if the new resistor happened to equal the existing total, which isn’t required by the basic rule.