## Electric Circuits Review

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Answers to Questions: All || #1-7 || #8-51 || #52-59 || #60-72

**Part A: Multiple-Multiple Choice**

1. Which of the following statements are true about an electric circuit? List all that apply.

- Electrons are the mobile charge carriers in an electric circuit.
- The path of charge flow from the + to the - terminal of the circuit can consist of nonconductive material.
- In an electric circuit of an automobile, the 12-Volt car battery is sometimes referred to as the internal circuit because it is located inside of the hood of the car.
- Charge is supplied with energy in the internal circuit and the energy is transformed into other forms in the external circuit.
- Charge is consumed as it moves through the energy-transforming devices of the external circuit. For instance, the amount of charge entering a light bulb in a second is less than that which exits the light bulb in a second.
- A battery is used to power a flashlight circuit. When the battery no longer works, it is because it has run out of charge.
- The location on an electric circuit where the charge possesses the greatest amount of electric potential energy is the + terminal of the battery.

a. b. c. d. e. f. g. |

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2. Which of the following statements are true about an electric potential or electric potential difference? List all that apply.

- Electric potential can be expressed in units of volts.
- Electric potential can also be expressed in units of Joules.
- The electric potential of a charge at a given location provides a measure of the rate at which charge flows past that point.
- Work must be done on a + charge to move it
*against*(i.e., in the opposite direction of) an electric field. - As a + charge moves in the same direction as an electric field, it gains electric potential.
- The electric potential difference between two points is simply the difference in potential energy possessed by charge between those two points.
- If a unit of charge has a high electric potential at any given location, then that charge possesses a large amount of electric potential energy at that location.
- The + terminal of a battery is a location with a higher electric potential than the - terminal of a battery.
- Charge flowing through a battery will experience a gain in electric potential.
- A 6-Volt battery would provide 12 Joules of energy to 2 Coulombs of charge as it is moved from the - to the + terminal.

a. b. c. d. e. f. g. h. i. j. |

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3. Which of the following statements are true about electric current? List all that apply.

- Electric current is measured in units of Amperes.
- Electric current and drift speed are synonymous terms.
- Electric current is defined as the number of Coulombs of charge which move past a point on a circuit.
- Electric current is equal to the number of Coulombs of charge which move past a point on a circuit per unit of time.
- Electric current provides a measure of how fast charge moves between two points on a circuit.
- The electric current diminishes in value as charge progresses to locations further and further from the + terminal of the battery.
- The electric current in a circuit will increase as the electric potential impressed across a circuit is increased.
- The electric current in a circuit will triple in value as the electric potential impressed across a circuit is increased by a factor of three.
- Suppose a miniature light bulb is connected to a battery in a circuit. A light bulb with a greater resistance will have a greater current.
- Wider conducting wires are capable of carrying larger currents.
- If one starts getting technical about the meaning of electric current, one could argue that electric current is not
*something*that flows past a point on a circuit, but rather*something*that exists to a given measure at a point on a circuit.

a. b. c. d. e. f. g. h. i. j. k. |

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4. Which of the following statements are true about an electric resistance? List all that apply.

- The resistance of an electric circuit is a measure of the overall amount of hindrance to the flow of charge through the circuit.
- A large resistance value indicates that the charge is encountering a relatively large amount of difficulty in moving through the circuit.
- The unit of resistance is the ampere.
- A 5-ohm resistor would allow a current of 0.5 Amperes when 2.5 Volts is impressed across it.
- A 10-ohm resistor would allow a current of 2 Amperes when 5 Volts is impressed across it.
- The resistance of a conducting wire will increase as the length of the wire is increased.
- The resistance of a conducting wire will increase as the cross-sectional area of the wire is increased.
- Increasing the resistance of an electric circuit will cause the current in the circuit to increase.
- A threefold increase in the resistance of an electric circuit will result in a threefold decrease in the electric current.
- A miniature light bulb with a specific resistance is connected to a 1.5-Volt battery to form a circuit. If it were connected to a 6-Volt battery instead, its resistance would increase by a factor of 4.

a. b. c. d. e. f. g. h. i. j. |

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5. Which of the following statements are true about electric power and electric potential energy? List all that apply.

- Power is the amount of energy used by an electrical appliance.
- Power is the rate at which energy is used by an electric circuit.
- A kiloWatt•hour is a unit of electric power.
- A Joule/second is a unit of power.
- A 60-Watt light bulb would
*consume*30 Joules of electrical energy in 2 seconds. - A 120-Watt light bulb would
*consume*1200 Joules of electrical energy in 6 seconds. - A charge moving through an electric circuit would gain electric potential energy in the internal circuit and lose electric potential energy in the external circuit.
- Charge has the greatest amount of electric potential energy at the - terminal of the battery.
- If a 60-Watt light bulb is placed in a 120-Volt circuit, then the current in the light bulb is 2 Amps.
- Consider two light bulbs with different power ratings. A 60-Watt light bulb has a greater resistance than a 100-Watt light bulb.

a. b. c. d. e. f. g. h. i. j. |

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6. Which of the following statements are true about a series circuit? List all that apply.

- Series circuits are characterized by the fact that there is a single pathway by which charge can travel from the + terminal to the - terminal.
- During any single loop of charge around a series circuit, the charge will pass through each resistor in the circuit.
- The overall resistance of a circuit increases as more and more resistors are placed in series in the circuit.
- The total current in a circuit increases as more and more resistors are placed in series in the circuit.
- Suppose that three identical resistors with a resistance of 3-ohms are placed in series with a 12-Volt battery. The current in the circuit is 4 Amps.
- Suppose that three identical resistors with a resistance of 3-ohms are placed in series with a 12-Volt battery. The electric potential difference across each resistor is 12 Volts.
- Suppose that two identical resistors are placed in series with a 12-Volt battery. The current in the circuit is 6 amps. The resistance of each resistor is 4 ohms.

a. b. c. d. e. f. g. |

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7. Which of the following statements are true about a parallel circuit? List all that apply.

- Parallel circuits are characterized by the fact that there are multiple pathways by which charge can travel from the + terminal to the - terminal.
- During any single loop of charge around a parallel circuit, the charge will pass through each resistor in the circuit.
- The overall resistance of a circuit increases as more and more resistors are placed in parallel in the circuit.
- The total current in a circuit increases as more and more resistors are placed in parallel in the circuit.
- Suppose that three identical resistors with a resistance of 3-ohms are placed in parallel with a 12-Volt battery. The current in the circuit is 1 Amp.
- Suppose that three identical resistors with a resistance of 3-ohms are placed in parallel with a 12-Volt battery. The electric potential difference across each resistor is 12 Volts.
- Suppose that two identical resistors are placed in parallel with a 12-Volt battery. The overall current in the circuit is 6 amps. The resistance of each resistor is 4 ohms.

a. b. c. d. e. _{Tot} = 1/R_{1} + 1/R_{2} + 1/R_{3} So for this circuit, substituting 3 Ohms for each of the resistors leads to a total resistance of 1 Ohm. The total current through the circuit is given by the equation I = (V f. g. _{Tot} = 1/R_{1} + 1/R_{2} Substituting 4 Ohms for each of the individual resistances leads to the overall resistance of 2 Ohms. This is definitely a true statement. |

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#### Navigate to:

Review Session Home - Topic Listing

Electric Circuits - Home || Printable Version || Questions with Links

Answers to Questions: All || #1-7 || #8-51 || #52-59 || #60-72

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