Exam 20: Electric Circuits

A battery is manufactured to have an emf of 24.0 V,but the terminal voltage is only 22.0 V when the battery is connected across a 10.0- resistor.What is the internal resistance of the battery?

How many electrons flow through a battery that delivers a current of 3.0 A for 12 s?

An uncharged 5.0-µF capacitor and a resistor are connected in series to a 12-V battery and an open switch to form a simple RC circuit.The switch is closed at t = 0 s.The time constant of the circuit is 4.0 s. -Determine the value of the resistance R.

Which one of the following statements concerning superconductors is false?

A 3.5-A current is maintained in a simple circuit with a total resistance of 1500 .What net charge passes through any point in the circuit during a thirty second interval?

Three parallel plate capacitors,each having a capacitance of 1.0 µF are connected in parallel. The potential difference across the combination is 100 V.What is the charge on any one of the capacitors?

The figure shows a circuit.The switch S can be closed on either point A or C,but not both at the same time.Use the following quantities: V₁ = V₂ = 12 V R₁ = R₄ = 1.0 W R₂ = R₃ = 2.0 W -Determine the current through R₄ when the switch S is closed on C.

The characteristics of five wires are given in the table. The gauge is a measure of the diameter of the wire;and #18 corresponds to a diameter of 1.2 × 10^-³ m;and #22 corresponds to a diameter of 6.4 × 10^-⁴ m.The resistivity of iron is 9.7 × 10^-⁸ × m;and the value for copper is 1.72 × 10^-⁸ 11ec9df8_b514_280c_8d20_295ba371075e_TB6393_11 × m. -Which one of the five wires has the largest resistance?

Five resistors are connected as shown in the diagram.The potential difference between points A and B is 25 V. -What is the current through the 3.6- resistor?

Five resistors are connected as shown in the diagram.The potential difference between points A and B is 25 V. -What is the equivalent resistance between the points A and B?

A 10.0-µF capacitor is charged so that the potential difference between its plates is 10.0 V. A 5.0-µF capacitor is similarly charged so that the potential difference between its plates is 5.0 V. The two charged capacitors are then connected to each other in parallel with positive plate connected to positive plate and negative plate connected to negative plate. -How much charge flows from one capacitor to the other when the capacitors are connected?

A computer monitor uses 1.5 A of current when it is plugged into a 120 V outlet.The monitor is never turned off.What is the yearly cost of operating the monitor if the cost of electricity is $0.14/kWh?

Complete the following statement: The unit kilowatt - hour measures

The figure shows variation of the current through the heating element with time in an iron when it is plugged into a standard 120 V,60 Hz outlet. -What is the peak voltage?

When two capacitors are connected in series,the equivalent capacitance of the combination is 120 µF.When the two are connected in parallel,however,the equivalent capacitance is 480 µF.What are the capacitances of the individual capacitors?

Determine the power dissipated by the 40- resistor in the circuit shown.

Complete the following statement: A simple series circuit contains a resistance R and an ideal battery.If a second resistor is connected in parallel with R,

An RC circuit consists of a resistor with resistance 1.0 k,a 120-V battery,and two capacitors,C₁ and C₂,with capacitances of 20.0 µF and 60.0 µF,respectively.Initially,the capacitors are uncharged;and the switch is closed at t = 0 s. -How much charge will be stored in each capacitor after a long time has elapsed?

A 10.0-µF capacitor is charged so that the potential difference between its plates is 10.0 V. A 5.0-µF capacitor is similarly charged so that the potential difference between its plates is 5.0 V. The two charged capacitors are then connected to each other in parallel with positive plate connected to positive plate and negative plate connected to negative plate. -How much energy is dissipated when the two capacitors are connected together?

Some light bulbs are connected in parallel to a 120 V source as shown in the figure.Each bulb dissipates an average power of 60 W.The circuit has a fuse F that burns out when the current in the circuit exceeds 9 A.Determine the largest number of bulbs,which can be used in this circuit without burning out the fuse.