DSM 24 DC Circuits

Consider the simple arrangement of three resistors shown. Assume R sub A is greater than R sub B is greater than R sub C. The total equivalent resistance of the arrangement will be ______. A. larger than the resistance of resistor A B. equal to the resistance of resistor B C. smaller than the resistance of resistor C D. none of these

A. larger than the resistance of resistor A

Consider the simple arrangement of three resistors shown. Assume R>A is greater than R>B is greater than R>C. The total equivalent resistance of the arrangement will be ______. A. smaller than the resistance of resistor C B. larger than the resistance of resistor A C. equal to the resistance of resistor B D. none of these

A. smaller than the resistance of resistor C

Suppose you have a network of resistors with a total resistance R sub eq is equal to R sub I. If you hook up one more small resistor (compared to R sub i) in series with the original network, what would happen to the overall equivalent resistance? A. R sub eq will decrease a small amount. B. R sub eq will increase a small amount. C. R sub eq will increase a large amount. D. R sub eq will decrease a large amount.

B. Req will increase a small amount.

Consider an electric current travelling across a series of two resistors A and B, experiencing a total voltage drop of delta V. What parameter(s) are involved in determining what fraction of the total voltage drop will be experienced by resistor A? A. No parameters are needed; each resistor will get exactly half of the total voltage drop. B. The resistance of both resistors are the determining factors. C. The resistance of resistor B is the determining factor. D. The resistance of resistor A is the determining factor.

B. The resistance of both resistors are the determining factors.

Consider the network of 4 resistors shown. Resistor B and resistor C are ______. A. in series with each other B. neither in series nor in parallel with each other C. in parallel with each other D. unknown, because we cannot tell from the information given

B. neither in series nor in parallel with each other

Consider the circuit shown. When hooked up to a certain battery, there will be a current, I, moving to the right in the top wire (above resistor A). How would the current through resistor A compare to the current through the bottom section of wire between the points marked n and m? A. The current through resistor A will be smaller than the current through the bottom wire. B. The current through resistor A will be larger than the current through the bottom wire. C. The current through resistor A will be the same as the current through the bottom wire. D. The current through resistor A will be twice that of the current through the bottom wire.

C. The current through resistor A will be the same as the current through the bottom wire.

A few different circuit elements (batteries, resistors, capacitors, etc.) are connected so that all of them are in parallel. What do all of them have in common? A. The equivalent resistance of each one is the same. B. The current through each one is the same. C. The voltage across each one is the same. D. The inductive reactance of each one is the same.

C. The voltage across each one is the same.

Consider the following statement: "If you connect another resistor to an existing network of resistors, the total equivalent resistance will decrease." Is this true? A. No, adding another resistor never increases the total resistant B. Yes, but only if the new resistor is connected in series with the existing network. C. Yes, but only if the new resistor is connected in parallel with the existing network. D. Yes, adding another resistor always increases the total resistance.

C. Yes, but only if the new resistor is connected in parallel with the existing network.

Consider the network of 4 resistors shown. Resistor C and resistor D are ______. A. neither in series nor in parallel with each other B. in parallel with each other C. in series with each other D. unknown, because we cannot tell from the information given

C. in series with each other

Current is defined (mathematically) by the equation I is equal to start fraction delta Q over delta t end fraction (for average current) or I is equal to start fraction dQ over dt end fraction (for instantaneous current, using calculus). Using whichever definition you are comfortable with, when considering current in a wire, this can be stated (conceptually) as which of the following? A. Current is distance times charge (d times Q) divided by distance times time (d times t). B. Current is the amount of charge in a wire, divided by the time it takes to fill the wire with charge. C. Current is the rate at which the total charge within the wire is changing. D. Current is the rate at which charge passes a certain place in the wire.

Current is the rate at which charge passes a certain place in the wire.

Suppose you have two identical resistors with resistance R. If you combine them in series, what will the total equivalent resistance be? A. R sub eq is equal to 0.5 times R B. R sub eq is equal to 0.67 times R C. R sub eq is equal to 1.5 times R D. R sub eq is equal to 2 times R

D. Req =2R

Consider the network of 4 resistors shown. Resistor A and resistor D are ______. A. in series with each other B. in parallel with each other C. unknown, because we cannot tell from the information given D. neither in series nor in parallel with each other

D. neither in series nor in parallel with each other

Suppose you have two identical resistors with resistance R. If you combine them in parallel, what will the total equivalent resistance be? A. R sub eq is equal to start fraction 3 times R over 2 end fraction B. R sub eq is equal to start fraction 1 over 2 times R end fraction C. R sub eq is equal to R over 2 D. R sub eq is equal to start fraction 2 times R over 1 end fraction

Req =r/2

Circuit diagrams are almost always drawn with the assumption that the wires shown are "ideal wires." What is the "ideal wire" approximation? A. Ideal wires refer to most wires used in real circuits, which have excellent flexibility and can be bent at angles even greater than 90 degrees. B. Ideal wires refer to the wires we draw in a circuit diagram and have no resistance, and therefore have the same electric potential at all points on the wire. C. Ideal wires refer to the wires we draw in a circuit diagram and carry zero current, creating an idealized break in the path of the current. D. Ideal wires refer to most wires used in real circuits, which are highly rigid and cannot be bent at angles above about 10 degrees.

Ideal wires refer to the wires we draw in a circuit diagram and have no resistance, and therefore have the same electric potential at all points on the wire.

When an electric current passes through a light bulb, what happens to the current? A. It decreases as it passes through the lightbulb. B. It is unchanged after passing through the lightbulb. C. It increases as it passes through the lightbulb. D. It may increase or decrease, depending on the resistance of the bulb.

It is unchanged after passing through the lightbulb.

Consider an idealized circuit diagram showing various elements (ideal resistors, ideal batteries, ideal wires, ideal capacitors, etc.). Which elements in the circuit obey Ohm's law, delta V is equal to I times R? A. Only the resistors B. Only the resistors and the batteries C. Only the resistors, batteries, and capacitors D. None of the elements on their own; only entire circuits obey Ohm's law.

Only the resistors

Suppose you have a network of resistors with a total resistance R sub eq is equal to R sub I. If you hook up one more small resistor (compared to R sub i) in parallel with the original network, what would happen to the overall equivalent resistance? A. R sub eq will increase a large amount. B. R sub eq will decrease a small amount. C. R sub eq will decrease a large amount. D. R sub eq will increase a small amount.

Req will decrease a large amount.

Suppose you have two identical resistors with resistance R. If you combine them in parallel, what will the total equivalent resistance be? A. R sub eq is equal to start fraction 2 times R over 1 end fraction B. R sub eq is equal to R over 2 C. R sub eq is equal to start fraction 1 over 2 times R end fraction. D. R sub eq is equal to start fraction 3 times R over 2 end fraction

Req=R/2

A few different circuit elements (batteries, resistors, capacitors, etc.) are connected in series. What do all of them have in common? A. The voltage across each one is the same. B. The current through each one is the same. C. The equivalent resistance of each one is the same. D. The capacitive reactance of each one is the same.

The current through each one is the same.

Consider the circuit shown. When hooked up to a certain battery, there will be a current, I, moving to the right in the top wire (above resistor A). How would the current through resistor A compare to the current through resistor B? A. The current through resistor A will be smaller than the current through resistor B. B. The current through resistor A is half that of the current through resistor B. C. The current through resistor A will be the same as the current through resistor B. D. The current through resistor A will be larger than the current through resistor B.

The current through resistor A will be larger than the current through resistor B.

Consider the circuit shown. When hooked up to a certain battery, there will be a current, I, moving to the right in the top wire (above resistor A). How would the current through resistor A compare to the current through resistor B plus the current through resistor C? A. The current through resistor A will be twice that of the current through resistor B plus the current through resistor C. Meaning IA = 2(IB + IC). B. The current through resistor A will be smaller than current through resistor B plus the current through resistor C. Meaning IA < IB + IC. C. The current through resistor A will be larger than current through resistor B plus the current through resistor C. Meaning IA > IB + IC. D. The current through resistor A will be the same as the current through resistor B plus the current through resistor C. Meaning IA = IB + IC.

The current through resistor A will be the same as the current through resistor B plus the current through resistor C. Meaning IA = IB + IC.

Consider an electric current, I, travelling through a circuit when it encounters a junction, splits into two branches A and B, and later rejoins back together. What parameter(s) are involved in determining the fraction of the original current, I, that travels path B? A.No parameters are needed; the current will split exactly in half. B. The equivalent resistance of each of the branches are the determining factors. C. The equivalent resistance of branch B is the determining factor. D. The equivalent resistance of branch A is the determining factor.

The equivalent resistance of each of the branches are the determining factors.

Real wires are made from "ohmic" materials, meaning they have some amount of resistance and obey Ohm's law. If we want to account for this in a circuit diagram, how do we do so? A. We include additional resistors representing the resistance of the wire and then treat the wires in the diagram as "ideal wires." B. The resistances of real wires are included in the resistances of the circuit elements they are connected to. C. The resistances of real wires is negligibly small compared to actual resistors, and small resistances cannot change the overall resistance enough to matter. D. The resistance of real wires creates inductive reactance in a circuit and must be included with other inductors, where appropriate.

We include additional resistors representing the resistance of the wire and then treat the wires in the diagram as âideal wires.â

Consider the following statement: "If you connect another resistor to an existing network of resistors, the total equivalent resistance will increase." Is this true? A. Yes, but only if the new resistor is connected in parallel with the existing network. B. Yes, adding another resistor always increases the total resistance. C. No, adding another resistor never increases the total resistance. D. Yes, but only if the new resistor is connected in series with the existing network.

Yes, but only if the new resistor is connected in series with the existing network.

Consider the network of 4 resistors shown. Resistor A and resistor B are ______. A. in parallel with each other B. neither in series nor in parallel with each other C. in series with each other D. unknown, because we cannot tell from the information given

in parallel with each other

Consider the simple arrangement of three resistors shown. Resistor A and resistor C are ______. A. in series with each other B. in parallel with each other C. neither in series nor in parallel with each other D. unknown, because we cannot tell from the information given

in series with each other