Problem 9.1CYU: Check Your Understanding Handheld calculators often use small solar cells to supply the energy... Problem 9.2CYU: Check Your Understanding Circuit breakers in a home are rated in amperes, normally in a range from... Problem 9.3CYU: Check Your Understanding In Example 9.4, the drift velocity was calculated for a 2.053-mm diameter... Problem 9.4CYU: Check Your Understanding The current density is proportional to the current and inversely... Problem 9.5CYU: Check Your Understanding Copper wires use routinely used for extension cords and house wiring for... Problem 9.6CYU: Check Your Understanding A strain gauge is an electrical device to measure strain, as shown below.... Problem 9.7CYU: Check Your Understanding The resistance between the two conductors of a coaxial cable depends on the... Problem 9.8CYU: Check Your Understanding The voltage supplied to your house varies as V( t )= V max sin( 2ft ) If a... Problem 9.9CYU: Check Your Understanding Electric motors have a reasonably high efficiency. A 100-hp motor can have... Problem 9.10CYU: Check Your Understanding Is the efficiency of the various light bulbs the only consideration when... Problem 1CQ: Can a wire cany a current and still be neutral—that is, have a total charge of zero? Explain. Problem 2CQ: Car batteries are rated in ampere-hours (Ah). To what physical quantity do ampere-hours correspond... Problem 3CQ: When working with high-power electric circuits, it is advised that whenever possible, you work... Problem 4CQ: Incandescent light bulbs are being replaced with more efficient LED and CFL light bulbs. Is there... Problem 5CQ: It was stated that the motion of an electron appears nearly random when an electrical field is... Problem 6CQ: Electric circuits are sometimes explained using a conceptual model of water flowing through a pipe.... Problem 7CQ: An incandescent light bulb is partially evacuated. Why you suppose that is? Problem 8CQ: The [R drop across a resistor means that there is a change in potential or voltage across the... Problem 9CQ: Do impurities in semiconducting materials listed in Table 9.1 supply free charges? (Hint Examine the... Problem 10CQ: Does the resistance of an object depend on the path current takes through it? Consider, for example,... Problem 11CQ: If aluminum and copper wires of the same length have the same resistance, which has the larger... Problem 12CQ: In Determining Field from Potential, resistance was defined as R=VI . In this section, we... Problem 13CQ: Shown below are the results of an experiment where four devices were connected across a variable... Problem 14CQ: The current I is measured through a sample of an ohmic material as a voltage V is applied, (a) What... Problem 15CQ: Common household appliances are rated at 110 V, but power companies deliver voltage in the kilovolt... Problem 16CQ: Your electric bill gives your consumption in units of kilowatt-hour (kW h). Does this unit... Problem 17CQ: Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a... Problem 18CQ: Ail immersion heater is a small appliance used to heat a cup of water for tea by passing current... Problem 19CQ: What requirement for superconductivity7 makes current superconducting devices expensive to operate? Problem 20CQ: Name two applications for superconductivity listed in this section and explain how superconductivity... Problem 21P: A Van de Graaff generator is one of the original particle accelerators and can be used to accelerate... Problem 22P: A cathode ray tube (CRT) is a device that produces a focused beam of electrons in a vacuum. The... Problem 23P: How many electrons flow through a point in a wire in 3.00s if there is a constant current of I= 4.00... Problem 24P: A conductor carries a current that is decreasing exponentially with time. The current is modeled as... Problem 25P: The quantity of charge through a conductor is modeledas Q=4.00Cs4t41.00Cst+6.00mc .What is the... Problem 26P: The current through a conductor is modeled as I(t)=Imsin(2[60Hz]t) . Write an equation for the... Problem 27P: The charge on a capacitor in a circuit is modeled as Q(t)=Qmaxcos(+) . What is the current through... Problem 28P: An aluminum wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps, (a) What is the... Problem 29P: The current of an election beam has a measuredcurrent of I=50.00A with a radius of 1.00 mm2. What is... Problem 30P: A high-energy proton accelerator produces a proton beam with a radius of r - 0,90 mm. The beam... Problem 31P: Consider a wire of a circular cross-section with a radius of R = 3.00mm. The magnitude of the... Problem 32P: The current of an electron beam has a measured current of I=50.00A with a radius of 1,00 mm2. What... Problem 33P: The current supplied to an ail conditioner unit is 4.00 amps. The air conditioner is wired using a... Problem 34P: What current flows through the bulb of a 3.00-V flashlight when its hot resistance is 3.60 ? Problem 35P: Calculate the effective resistance of a pocket calculator that has a 1.35-V battery and through... Problem 36P: How many volts are supplied to operate an indicator light on a DVD player that has a resistance of... Problem 37P: What is the resistance of a 20.0-m-long piece of 12-gauge copper wire having a 2.053-mm diameter? Problem 38P: The diameter of 0-gauge copper wire is 8.252 mm. Find the resistance of a 1.00-km length of such... Problem 39P: If the 0. 10.0-mm-diameter tungsten filament in a light bulb is to have a resistance of 0.200 at... Problem 40P: A lead rod has a length of 30.00 cm and a resistance of 5.00. What is the radius of the rod? Problem 41P: Find the ratio of the diameter of aluminum to copper wire, if they have the same resistance pet-... Problem 42P: What current flows through a 2.54-cm-diameter rod of Pure silicon that is 20.0 cm long, when 1.00103... Problem 43P: (a) To what temperature must you raise a copper wire,originally at 20.0C , to double its resistance,... Problem 44P: A resistor made of nichrome wire is used in an application where its resistance cannot change more... Problem 45P: Of what material is a resistor made if its resistance is 40.0% greater at 100.0C than at 20.0C ? Problem 46P: An electronic device designed to operate at any temperature in the range from 10.0C to 55.0C... Problem 47P: (a) Of what material is a wire made, if it is 25.0 m long with a diameter of 0.100 mm and has a... Problem 48P: Assuming a constant temperature coefficient of resistivity what is the maximum percent decrease in... Problem 49P: A copper wire has a resistance of 0.500 at 20.0°C and an iron wire has a resistance of 0.525 at the... Problem 50P: A 2.2-k resistor is connected across a D cell battery (1.5 V). What is the current through the... Problem 51P: A resistor rated at 250 k is connected across two D cell batteries (each 1.50 V) in series, with a... Problem 52P: A resistor is connected in series with a power supply of 20.00 V. The current measure is 0.50 A.... Problem 53P: A resistor is placed in a circuit with an adjustable voltage source. The voltage across and the... Problem 54P: The following table show the measurements of a current through and the voltage across a sample of... Problem 55P: A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any... Problem 56P: What is the maximum voltage that can be applied to a 10k resistor rated at 14W? Problem 57P: A heater is being designed that uses a coil of 14-gauge nichrome wire to generate 300 W using a... Problem 58P: An alternative to CFL bulbs and incandescent bulbs are light-emitting diode (LED) bulbs. A 100-W... Problem 59P: The power dissipated by a resistor with a resistance of R=100 is P = 2.0 W . What are the current... Problem 60P: Running late to catch a plane, a driver accidentally leaves the headlights on after parking the car... Problem 61P: SI. A physics student has a single-occupancy dorm loom. The student lias a small refrigerator that... Problem 62P: A 0.50-W, 220- resistor carries the maximumcurrent possible without damaging the resistor. If the... Problem 63P: Consider a power plant is located 60 km away from a residential area uses Q-gauge (A=42.40mm2) wire... Problem 64P: A wire is drawn through a die, stretching it to four times its original length. By what factor does... Problem 65P: Digital medical thermometers determine temperature by measuring the resistance of a semiconductor... Problem 66P: Electrical power generators are sometimes "load tested” by passing current through a large vat of... Problem 67P: A 12-guage gold wire has a length of 1 meter. (a) What would be the length of a silver 12-gauge wire... Problem 68P: What is the change in temperature required to decrease the resistance for a carbon resistor by 10%? Problem 69AP: A coaxial cable consists of an inner conductor with radius r1=0.25cm and an outer radius of r0=0.5cm... Problem 70AP: A 10.00-meter long wire cable that is made of copper has a resistance of 0.051 ohms, (a) What is the... Problem 71AP: A nichrome rod that is 3.00 mm long with a cross sectional area of 1.00 mm2 is used for a digital... Problem 72AP: The temperature in Philadelphia, PA can vary between 68.00F and 100.00F in one summer day. By what... Problem 73AP: When 100.0 V is applied across a 5-gauge (diameter 4.621 mm) wire that is 10 m long, the magnitude... Problem 74AP: A wire with a resistance of 5.0 is drawn out through a die so that its new Length is twice times... Problem 75AP: What is the resistivity of a wire of 5-gauge wire (A=16.8106m2) , 5.00 m length, and 5.10 m ... Problem 76AP: Coils are often used in electrical and electronic circuits. Consider a coil which is formed by... Problem 77AP: Currents of approximately 0.06 A can be potentially fatal. Currents in that range can make the heart... Problem 78AP: A 20.00-ohm; 5.00-watt resistor is placed in series with a power supply, (a) What is the maxim tun... Problem 79AP: A battery with an emf of 24.00 V delivers a constant current of 2.00 mA to an appliance. Haw much... Problem 80AP: A 12.00-V battery has an internal resistance of a tenth of an ohm. (a) What is the current if the... Problem 81CP: A 10-gauge copper wire has a cross-sectional area A=5.26mm2 and carries a current of I=5.00A . The... Problem 82CP: The current through a 12-gauge wire is given as I(t)=(5.00A)sin(260Hzt)). What is the current... Problem 83CP: A particle accelerator produces a beam with a radius of 1.25 mm with a current of 2.00 mA. Each... Problem 84CP: In this chapter, most examples and problems involved direct current (DC). DC circuits have the... Problem 85CP: A current of I= 25A is drawn from a 100-V batteryfor 30 seconds. By how much is the chemical energy... Problem 86CP: Consider a square rod of material with sides of length L = 3.00 cm with a current density of... Problem 87CP: A resistor of an unknown resistance is placed in an insulated container filled with 0.75 kg of... Problem 88CP: The charge that flows through a point in a wire as a function of time is modeled as... Problem 89CP: Consider a resistor made from a hollow cylinder of carbon as shown below. The inner radius of the... Problem 90CP: What is the current through a cylindrical wire of radiusR = 0.1 mm if the current density is J=J0Rr... Problem 91CP: A student uses a 100.00-W, 115.00-V radiant heater to heat the student’s dorm room, dining the hours... Problem 92CP: A 12-V car battery is used to power a 20.00-W, 12.00-V lamp during the physics club camping... Problem 93CP: A physics student uses a 115.00-V immersion heater to heat 400.00 grams (almost two cups) of water... format_list_bulleted