Chapter 34 35 ID: A

A closed circuit is a circuit in which charge a. Can flow. b. Is prevented from flowing.

a

Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have a. Less total resistance. b. More total resistance. c. Same total resistance.

a

Compared to thin wires, electrical resistance in thick wires is a. less. b. The same. c. greater.

a

The total resistance of a 6Ohm resistor and a 12Ohm resistor in parallel is a. 4 ohms. b. 6 ohms. c. 18 ohms. d. 20 ohms.

a

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The current is larger in the lamp with the a. Thick filament. b. Thin filament. c. Current is the same in both.

a

Two lamps, one with a thick filament and one with a thin filament, are connected in series to a battery. The voltage is greater across the lamp with the a. Thin filament. b. Thick filament. c. Voltage is the same for both.

a

When one light bulb in a series circuit containing several light bulbs burn out a. None of the other bulbs will light up. b. Nothing changes in the rest of the circuit. c. The other light bulbs burn brighter.

a

When resistors are put in parallel with each other their overall resistance is a. Smaller than the resistance of any of the resistors. b. Larger than the resistance of any other resistor. c. The same as the resistance of one of the resistors.

a

An ampere is a a. Unit of resistance. b. Unit of current. c. Type of charge. d. voltage.

b

In a simple parallel circuit a. Current through each branch is always the same. b. Voltage across each branch is always the same. c. Value of each resistor is the same. d. The circuit won't work unless there is a fuse in it. e. None of the above.

b

In order for current to flow in a circuit, you must have a. A switch that is open. b. A complete path for the current. c. Two light bulbs in parallel. d. Two light bulbs in series. e. All of the above.

b

In solid conductors, electric current is the flow of a. Positive and negative charges. b. electrons. c. Negative ions. d. protons. e. None of the above.

b

When an 8V battery is connected to a resistor, 2A of current flows in the resistor. What is the resistor's value? a. 2 Ohms b. 4 Ohms c. 8 Ohms d. 16 Ohms

b

When resistors are put in series next to each other, their overall resistance is a. The same as the resistance of one of the resistors. b. Larger than the resistance of any individual resistor. c. Smaller than the resistance of any of the resistors.

b

When two light bulbs are connected in series, the a. Current through each light bulb is proportional to the resistance of the bulb. b. Same amount of current always flows through each bulb. c. Neither A nor B.

b

Which of the following is a device used to either cut off or allow electrons to flow in a circuit? a. battery. b. switch. c. resistor. d. Connecting wire.

b

As more lamps are put into a series circuit, the overall current in the circuit a. Stays the same. b. increases. c. decreases.

c

In order for there to be flow of charge from one place to another, there must be a a. Conductor, such as a wire, connecting two places. b. Potential differences between two places. c. Both A and B.

c

The current through a 5 Ohm resistor connected to a 150V power supply is a. 1A. b. 10A. c. 30A. d. 150A. e. None of the above.

c

The current through two identical light bulbs connected in series is 0.25A. A total voltage across both bulbs is 120V. The resistance of a single bulb is a. 24 Ohms. b. 48 Ohms. c. 240 Ohms. d. 480 Ohms.

c

Electrical resistance in a wire depends on the wire's a. thickness. b. conductivity. c. length. d. All of the above.

d

In a simple parallel circuit a. Voltage across each branch is the same. b. Current through each resistor is inversely proportional to the resistance. c. Current is divided at each branch. d. All of the above. e. None of the above.

d

The symbol used to represent resistance in a schematic diagram is a. Two straight lines. b. A single line that is broken and has a bend in it. c. One straight line. d. A zigzag line. e. None of the above.

d

The total resistance of a 10Ohm resistor and a 7Ohm resistor in a series is a. 2 ohms. b. 3 ohms. c. 7 ohms. d. 17 ohms. e. 70 ohms.

d

In order to form an electric current circuit. You need to have a. Wires or conductors to connect everything. b. A power source. c. A light bulb or some resistance. d. A complete path for a current. e. All of the above.

e