Chapter 9 Review - Series and Parallel Circuits

Which pair of options below would result in a greater reading on V_B in the figure below?

• increase the battery voltage or decrease R_B

• decrease the battery voltage or decrease R_B

• increase the battery voltage or decrease R_A

• decrease the battery voltage or decrease R_A

If you have a 90 V power source with a 30-Ω and 60-Ω resistor in series, what is the voltage drop over the 60-Ω resistor?

• 30 V

• 2 V

• 60 V

• 90 V

Which pair of options below would result in a lower reading on V_B in the figure below?

• increase the battery voltage or decrease R_B

• decrease the battery voltage or decrease R_B

• decrease the battery voltage or decrease R_A

• increase the battery voltage or increase R_A

Two 240.0-Ω resistors are connected in parallel and placed across a 12.0-V battery. What is the current in each branch of the circuit?

• 0.0125 A

• 0.100 A

• 0.0500 A

• 0.0250 A

What is the equation to find current in a series of three resistors?

• I = V/(R₁ + R₂ + R₃)

• I = V/(R₁ × R₂ × R₃)

• I = V(R₁ × R₂ × R₃)

• I = V(R₁ + R₂ + R₃)

A 20.0-Ω resistor and a 40.0-Ω resistor are connected in series to a 20.0-V battery. What is the voltage drop across the 40.0-Ω resistor?

• 18.7 V

• 13.3 V

• 6.70 V

• 30.0 V

In the figure below, if a third resistor were added to the circuit somewhere between resistors A and B, how would the reading on the bottom ammeter change, if at all?

• This cannot be determined without knowing the value of the new resistor.

• It would decrease.

• It would increase.

• It wouldn’t change.

What happens to lights in series if one goes out?

• they all go out

• every other one goes out

• they flicker

• they stay lit

In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.

• path

• voltage

• power

• current

If in the figure below resistor D were added in parallel to the other resistors, how would the voltages across resistors A and B be affected?

• A’s would increase; B’s would decrease.

• They would both increase.

• They would both decrease.

• They would both remain the same.