Exam 28: Fundamentals of Circuits

A galvanometer coil having a resistance of 20 Ω and a full-scale deflection at 1.0 mA is connected in series with a 4980 Ω resistance to build a voltmeter.What is the maximum voltage that this voltmeter can read?

A multiloop circuit is shown in the figure.Some circuit quantities are not labeled.It is not necessary to solve the entire circuit.The current I₂ is closest to

A light bulb is connected in the circuit shown in the figure with the switch S open.All the connecting leads have no appreciable resistance and the battery has no internal resistance.When we close the switch,which statements below accurately describe the behavior of the circuit? (There may be more than one correct choice.) A)The brightness of the bulb will increase. B)The brightness of the bulb will decrease. C)The brightness of the bulb will not change. D)The potential drop across R₂ will decrease. E)The potential drop across R₂ will not change.

A multiloop circuit is shown in the figure.Some circuit quantities are not labeled.It is not necessary to solve the entire circuit.The emf ε is closest to

Two light bulbs,B₁ and B₂,are connected to a battery having appreciable internal resistance as shown in the figure.What happens to the brightness of bulb B₁ when we close the switch S?

The voltage and power ratings of a particular light bulb,which are its normal operating values,are 110 V and 60 W.Assume the resistance of the filament of the bulb is constant and is independent of operating conditions.If the light bulb is operated with a current that is 50% of the current rating of the bulb,what is the actual power drawn by the bulb?

Three resistors having resistances of 4.0 Ω,6.0 Ω,and 10.0 Ω are connected in parallel.If the combination is connected in series with an ideal 12-V battery and a 2.0-Ω resistor,what is the current through the 10.0-Ω resistor?

The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire,whose diameter is 0.86 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m.If the toaster is operated at a voltage of 120 V,how much power does it draw?

When four identical resistors are connected to an ideal battery of voltage V = 10 V as shown in the figure,the current I is equal to 0.20 A.What is the value of the resistance R of the resistors?

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.The current I₂ is closest to

A light bulb is connected to a 110-V source.What is the resistance of this bulb if it is a 100-W bulb?

Two identical resistors of resistance R = 24 Ω and a variable resistor R_x are connected to an ideal battery of voltage V as shown in the figure.What should be the value of the variable resistance R_x to make the voltage across the two parallel resistors equal to .

Three resistors are connected across an ideal 2.0-V DC battery as shown in the figure. (a)At what rate does the battery supply energy to the resistors? (b)At what rate is heat produced in the 6.0-Ω resistor?

An uncharged 30.0-µF capacitor is connected in series with a 25.0-Ω resistor,a DC battery,and an open switch.The battery has an internal resistance of 10.0 Ω and the open-circuit voltage across its terminals is 50.0 V.The leads have no appreciable resistance.At time t = 0,the switch is suddenly closed. (a)What is the maximum current through the 25.0-Ω resistor and when does it occur (immediately after closing the switch or after the switch has been closed for a long time)? (b)What is the maximum charge that the capacitor receives? (c)When the current in the circuit is 0.850 A,how much charge is on the plates of the capacitor?

The emf and the internal resistance of a battery are as shown in the figure.When the terminal voltage V_ab is equal to 17.4 V,what is the current through the battery,including its direction?

The resistivity of gold is 2.44 × 10^-8 Ω ∙ m at room temperature.A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA.How much power is dissipated in the wire?

Consider the circuit shown in the figure.Note that two currents are shown.Calculate the emfs ε₁ and ε₃.

The power rating of a 400-Ω resistor is 0.800 W. (a)What is the maximum voltage that can be applied across this resistor without damaging it? (b)What is the maximum current this resistor can draw without damaging it?

In the figure,when the terminal voltage V_ab of the battery is equal to 20 V,how much current passes through the battery,including its direction?

The voltage and power ratings of a particular light bulb,which are its normal operating values,are 110 V and 60 W.Assume the resistance of the filament of the bulb is constant and is independent of operating conditions.If the light bulb is operated at a reduced voltage and the power drawn by the bulb is 36 W,what is the operating voltage of the bulb?