Exam 23: Circuits

A 9 V battery is hooked up to two resistors in series.One has a resistance of 5 Ω and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.Which statement is true?

When a potential difference of 10 V is placed across a certain solid cylindrical resistor,the current through it is 2.0 A.If the diameter of this resistor is now tripled,the current will be 18 A.

A resistor is made out of a low wire having a length L.Each end of the wire is attached to a terminal of a battery having a constant voltage Vo.A current I flows through the wire.If the wire were cut in half,making two wires of length L/2,and both wires were attached to the battery (the end of both wires attached to one terminal,and the other ends attached to the other terminal),what would be the total current flowing through the two wires?

A 10.0 V battery is connected across two resistors in series.If the resistors have resistances of 840.0 Ω and 590.0 Ω ,what is the voltage drop across the 590.0 Ω resistor?

Identical batteries are connected in different arrangements to the same lightbulb,as shown in the figure.For which arrangement will the bulb shine the brightest?

In the circuit shown,the resistor R₂ is adjustable.As its resistance is made larger,the voltage at point A

In a discharging RC circuit,it takes one time constant for the capacitor to discharge completely.

Initially,for the circuit shown,the switch S is open and the capacitor is uncharged.The switch S is closed at time t = 0.In the figure shown,when the time t is equal to 20.0 s,the potential difference across the resistor is closest to:

If a 75 W bulb and a 100 W bulb are connected in series across a 120 V outlet,the 75 W bulb will dissipate 75 W of power and the 100 W bulb will dissipate 100 W of power.

Identical lightbulbs are attached to identical batteries,as shown in the figure.The ranking (from lowest to highest)of the total power emitted from the lightbulb(s)is:

What is the current through resistor R₃ in this circuit?

Identical batteries are connected in different arrangements to the same lightbulb,as shown in the figure.For which arrangement will the bulb shine the least?

In the circuit shown,what current does the ammeter read?

A 9 V battery is hooked up to two resistors in series.One has a resistance of 5 Ω,and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.Through which resistor is energy being dissipated at the higher rate?

Draw a circuit with two batteries,a resistor between them,and a capacitor in parallel with the resistor.The batteries are connected negative pole to positive pole.

Refer to the figure shown.What is the current through the 4.0 Ω resistor?

A circuit requires a 500 Ω resistor,but all that is available are 1 kΩ resistors.If the 1 kΩ resistors are in abundant supply,how can they be combined to achieve the desired resistance?

A 9 V battery is hooked up to two resistors in series.One has a resistance of 5 Ω,and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.If the voltage is zero at the negative terminal of the battery,the voltage at location B is

The capacitor shown in the circuit in the figure is initially uncharged when the switch S is suddenly closed.After one time constant,the current through the resistor will be closest to:

If the graph of the current through a resistor as a function of the potential difference across it is a straight line with a positive slope passing through the origin,the resistor obeys Ohm's law and the slope of this graph is equal to the resistance of this resistor.