Exam 21: Electric Current and Direct-Current 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.Through which resistor is energy being dissipated at the higher rate?

The network shown is assembled with uncharged capacitors X ,Y,and Z,with And The switches S₁ and S₂ are initially open,and a potential difference V_ab = 120 V is applied between points a and b.After the network is assembled,switch S₁ is then closed,but switch S₂ is kept open.How much energy is finally stored in capacitor X?

A 6.0-V battery that can store 500.0 J. Of energy is connected to a resistor.How much charge must flow between the battery's terminals to completely drain the battery if it is fully charged? Assume that the voltage of the battery remains the same until it is totally drained.

A charge of 12 C passes through an electroplating apparatus in 2.0 min.What is the average current in the apparatus?

What current flows from the battery in the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

If the resistance in a constant voltage circuit is doubled,the power dissipated by that circuit will

A tube of mercury with resistivity 9.84 × 10^-7 Ω ∙ m has a uniform electric field of 23 N/C inside the mercury.How much current is flowing in the tube,if the radius of the tube is 0.495 mm?

A system of four capacitors is connected across a 90-V voltage source as shown in the figure.What is the equivalent capacitance of this system?

Consider two copper wires of equal length.One wire has twice the cross-sectional area of the other.How do the resistances of these two wires compare?

For the graph shown in the figure,what physical quantity does the slope of the graph represent for a dc circuit?

A multiloop circuit is shown in the figure.Find the current I₁ if the batteries are ideal.(It is not necessary to solve the entire circuit. )

A 9-V battery is hooked up to two resistors in series using wires of negligible resistance.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 statements about this circuit are true? (There could be more than one correct choice. )

A 22-A current flows into a parallel combination of 4.0-Ω,6.0-Ω,and 12-Ω resistors.What current flows through the 12-Ω resistor?

A 100-W resistance heater is connected to a 110-V dc source.What current flows through the heater?

A 8.0-μF uncharged capacitor is connected in series with a 6.0-kΩ resistor,an ideal 20-V dc source,and an open switch.If the switch is closed at time t = 0.0 s,what is the charge on the capacitor at t = 9.0 ms?

Three resistors of resistances 4.0 Ω,6.0 Ω,and 10 Ω are connected in parallel.If this combination is now connected in series with an ideal 12-V battery and a 2.0-Ω resistor,what is the current through the 10-Ω resistor?

A battery is rated such that it provides Of power at When fully charged.How much current can it deliver?

The lamps in a string of decorative lights are connected in parallel across a constant-voltage power source.What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps. )

What is the equivalent resistance in the circuit shown in the figure?

A jeweler needs to electroplate gold,having an atomic mass of 196.97 g/mol,onto a bracelet.He knows that the charge carriers in the ionic solution are singly-ionized gold ions,Au⁺,and has calculated that he must deposit Of gold to reach the necessary thickness.How much current does he need to plate the bracelet in 3.0 hours? (e = 1.60 × 10^-19 C,N_A = 6.02 × 10²³ atoms/mol)