BOSS BATTLE PRACTICE 21

The current flowing through the 8.45-Ω resistor in the figure is 10.83A. What is the voltage of the battery? Round to the nearest whole number.

246 V

These two resistors are connected in ____. a. series b. parallel c. neither

A

Which of the following statements are true about an electric resistance? List all that apply. Type in your responses with the letters in alphabetical order with no commas or spaces. A. The resistance of an electric circuit is a measure of the overall amount of hindrance to the flow of charge through the circuit. B. A large resistance value indicates that the charge is encountering a relatively large amount of difficulty in moving through the circuit. C. The unit of resistance is the ampere. D. A 5-ohm resistor would allow a current of 0.5 Amperes when 2.5 Volts is impressed across it. E. A 10-ohm resistor would allow a current of 2 Amperes when 5 Volts is impressed across it. F. The resistance of a conducting wire will increase as the length of the wire is increased. G. The resistance of a conducting wire will increase as the cross-sectional area of the wire is increased. H. Increasing the resistance of an electric circuit will cause the current in the circuit to increase. I. A threefold increase in the resistance of an electric circuit will result in a threefold decrease in the electric current. J. 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, D, F, I

Which of the following diagrams represents resistors connected in in parallel? List all that apply.

A, C

Which of the following statements are true about a parallel circuit? List all that apply. A. Parallel circuits are characterized by the fact that there are multiple pathways by which charge can travel from the + terminal to the - terminal. B. During any single loop of charge around a parallel circuit, the charge will pass through each resistor in the circuit. C. The overall resistance of a circuit increases as more and more resistors are placed in parallel in the circuit. D. The total current in a circuit increases as more and more resistors are placed in parallel in the circuit. E. 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. F. 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. G. 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, D, F, G

Consider the circuit shown. Find the current through each resistor using the rules of parallel and series circuits. Make sure to type in the units. The first box is for I 1, 2nd box for I 2, and third for I 3

Answer for blank #1: 0.92 A Answer for blank #2: 0.27 A Answer for blank # 3: 0.65 A

If a third resistor (R3), identical to the other two, is added in series with the first two, then the electric potential difference (voltage drop) across each of the three individual resistors will ____. a. increase b. decrease c. remain the same

B

These two resistors are connected in ____. a. series b. parallel c. neither

B

When you turn on the room lights, they light immediately. This is best explained by the fact that ____. a. electrons move very fast from the switch to the light bulb filament b. electrons present everywhere in the circuit move instantly

B

Which of the following diagrams represents resistors connected in in series? List all that apply.

B

The role or purpose of the battery in this circuit is to ____. Choose three. a. supply electric charge so that a current can exist b. supply energy to the charge c. move the charge from the - to the + terminal of the battery d. transform energy from electrical energy into light energy e. establish an electric potential difference between the + and - terminals f. replenish the charge which is lost in the light bulb g. offer resistance to the flow of charge so that the light bulb can get hot

B, C, E

A high resistance light bulb and a low resistance light bulb are connected in series to a 6-Volt pack of batteries. Which of the two light bulbs will shine the brightest? a. They will have the same brightness. b. The low-R bulb will shine more brightly. c. The high-R bulb will shine more brightly. d. There is no way to make such a prediction since bulb brightness is independent of bulb resistance.

C

If a third resistor (R3), identical to the other two, is added in series with the first two, then the overall resistance will ____ and the overall current will ____. a. increase, increase b. decrease, decrease c. increase, decrease d. decrease, increase e. increase, remain the same f. decrease, remain the same g. remain the same, increase h. remain the same, decrease i. remain the same, remain the same

C

If an electric circuit was analogous to a water park, then the electric current would be analogous to the ____. a. pipes which carry the water through the water circuit b. pump which supplies energy to move the water from the ground to a high elevation c. the people which flow from the top of the water ride to the bottom of the water ride d. the rate at which water is pumped onto the slide e. the change in potential energy of the riders f. the top of the water slide g. the bottom of the water slide h. the long lines which exist at the park i. the speed at which riders move as they slide from the top to the bottom of the ride

D

The electric circuit shown consists of a battery and three identical light bulbs. Which of the following statements are true concerning this circuit? List all that apply. a. The electric potential difference between X and Y is more than that between Y and Z. b. The electric potential difference between X and Z is more than that between Y and W. c. The electric potential difference between X and Y is the same as that between Y and Z. d. The electric potential difference between X and Z is the same as that between Y and W. e. The electric potential difference between Y and W is more than that between X and Y.

D, E

If 6 coulombs of charge flow past point 'A' in a circuit in 4 seconds, then ____ coulombs of charge will flow past point 'A' in 8 seconds. a. 0.67 b. 1.5 c. 2 d. 3 e. 4 f. 6 g. 8 h. 12 i. 24

H

Analyze the following circuit and determine the values of the total resistance, total current, and the current at and voltage drops across each individual resistor. Do this on a separate piece of paper and bring to your teacher to grade

SHORT ANSWER

Use proper schematic symbols to construct a diagram of a circuit powered by a 6-Volt battery that consists of two 3-ohm resistors connected in parallel. Place an ammeter in series with each of the individual resistors in a manner that the current through each resistor can be measured. Place a third ammeter in a location such that the overall current in the circuit can be measured. On the schematic diagram, use an unbroken arrow to indicate the direction of conventional current. Finally, indicate the ammeter readings on the diagram.

SHORT ANSWER

Use proper schematic symbols to construct a diagram of a circuit powered by a 6-Volt battery that consists of two 3-ohm resistors connected in series. Place ammeters in series at a location such that the current through each resistor can be measured and in a location such that the overall current in the circuit can be measured. On the schematic diagram, use an unbroken arrow to indicate the direction of conventional current. Finally, indicate the ammeter readings on the diagram.

SHORT ANSWER