1 Physics And Measurement 2 Motion In One Dimension 3 Vectors 4 Motion In Two Dimensions 5 The Laws Of Motion 6 Circular Motion And Other Applications Of Newton’s Laws 7 Energy Of A System 8 Conservation Of Energy 9 Linear Momentum And Collisions 10 Rotation Of A Rigid Object About A Fixed Axis 11 Angular Momentum 12 Static Equilibrium And Elasticity 13 Universal Gravitation 14 Fluid Mechanics 15 Oscillatory Motion 16 Wave Motion 17 Sound Waves 18 Superposition And Standing Waves 19 Temperature 20 The First Law Of Thermodynamics 21 The Kinetic Theory Of Gases 22 Heat Engines, Entropy, And The Second Law Of Thermodynamics 23 Electric Fields 24 Gauss’s Law 25 Electric Potential 26 Capacitance And Dielectrics 27 Current And Resistance 28 Direct-current Circuits 29 Magnetic Fields 30 Sources Of The Magnetic Field 31 Faraday’s Law 32 Inductance 33 Alternating Current Circuits 34 Electromagnetic Waves 35 The Nature Of Light And The Principles Of Ray Optics 36 Image Formation 37 Wave Optics 38 Diffraction Patterns And Polarization 39 Relativity Chapter27: Current And Resistance
Chapter Questions Section: Chapter Questions
Problem 27.1QQ: Consider positive and negative charges of equal magnitude moving horizontally through the four... Problem 27.2QQ Problem 27.3QQ Problem 27.4QQ: When does an incandescent lightbulb carry more current, (a) immediately after it is turned on and... Problem 27.5QQ: For the two lightbulbs shown in Figure 27.13, rank the current values at points a through f from... Problem 27.1OQ: Car batteries are often rated in ampere-hours. Does this information designate the amount of (a)... Problem 27.2OQ Problem 27.3OQ: A cylindrical metal wire at room temperature is carrying electric current between its ends. One end... Problem 27.4OQ Problem 27.5OQ: A potential difference of 1.00 V is maintained across a 10.0- resistor for a period of 20.0 s. What... Problem 27.6OQ: Three wires are made of copper having circular cross sections. Wire 1 has a length L and radius r.... Problem 27.7OQ: A metal wire of resistance R is cut into three equal pieces that are then placed together side by... Problem 27.8OQ: A metal wire has a resistance of 10.0 at a temperature of 20.0C. If the same wire has a resistance... Problem 27.9OQ: The current-versus-voltage behavior of a certain electrical device is shown in Figure OQ27.9. When... Problem 27.10OQ: Two conductors made of die same material are connected across the same potential difference.... Problem 27.11OQ: Two conducting wires A and B of the same length and radius are connected across the same potential... Problem 27.12OQ: Two lightbulbs both operate on 120 V. One has a power of 25 W .and the other 100 W. (i) Which... Problem 27.13OQ: Wire B has twice the length and twice the radius of wire A. Both wires are made from the same... Problem 27.1CQ: If you were 10 design an electric healer using Nichrome wire as the healing element, what parameters... Problem 27.2CQ Problem 27.3CQ: When the potential difference across a certain conductor is doubled, the current is observed to... Problem 27.4CQ: Over the lime interval after a difference in potential is applied between the ends of a wire, what... Problem 27.5CQ: How does the resistance for copper and for silicon change with temperature? Why are the behaviors of... Problem 27.6CQ: Use the atomic theory of matter to explain why the resistance of a material should increase as its... Problem 27.7CQ: If charges flow very slowly through a metal, why does it not require several hours for a light to... Problem 27.8CQ: Newspaper articles often contain statements such as 10 000 volts of electricity singed through the... Problem 27.1P Problem 27.2P: A small sphere that carries a charge q is whirled in a circle at the end of an insulating string.... Problem 27.3P Problem 27.4P: In the Bohr model of the hydrogen atom (which will be covered in detail in Chapter 41), an electron... Problem 27.5P: A proton beam in an accelerator carries a current of 125 A. If the beam is incident on a target, how... Problem 27.6P Problem 27.7P Problem 27.8P: Figure P26.6 represents a section of a conductor of nonuniform diameter carrying a current of I =... Problem 27.9P: The quantity of charge q (in coulombs) that has passed through a surface of area 2.00 cm2 varies... Problem 27.10P: A Van de Graaff generator (see Problem 24) produces a beam of 2.00-MeV deuterons, which are heavy... Problem 27.11P: The electron beam emerging from a certain high-energy electron accelerator has a circular cross... Problem 27.12P: An electric current in a conductor varies with time according to the expression I(t) = 100 sin... Problem 27.13P: A teapot with a surface area of 700 cm2 is to be plated with silver. It is attached to the negative... Problem 27.14P: A lightbulb has a resistance of 240 when operating with a potential difference of 120 V' across it.... Problem 27.15P Problem 27.16P: A 0.900-V potential difference is maintained across a 1.50-in length of tungsten wire that has a... Problem 27.17P: An electric heater carries a current of 13.5 A when operating at a voltage of 120 V. What is the... Problem 27.18P Problem 27.19P Problem 27.20P Problem 27.21P: A portion of Nichrome wire of radius 2.50 mm is to be used in winding a heating coil. If the coil... Problem 27.22P: If the current carried by a conductor is doubled, what happens to (a) the charge carrier density,... Problem 27.23P Problem 27.24P Problem 27.25P: If the magnitude of the drill velocity of free electrons in a copper wire is 7.84 10-4 m/s, what is... Problem 27.26P Problem 27.27P Problem 27.28P: While taking photographs in Death Valley on a day when the temperature is 58.0C, Bill Hiker rinds... Problem 27.29P Problem 27.30P: Plethysmographs are devices used for measuring changes in the volume of internal organs or limbs. In... Problem 27.31P Problem 27.32P: An engineer needs a resistor with a zero overall temperature coefficient of resistance at 20.0C. She... Problem 27.33P: An aluminum wire with a diameter of 0.100 mm has a uniform electric field of 0.200 V/m imposed along... Problem 27.34P: Review. Ail aluminum rod has a resistance of 1.23 at 20.0C. Calculate the resistance of the rod at... Problem 27.35P: At what temperature will aluminum have a resistivity that is three times the resistivity copper has... Problem 27.36P: Assume that global lightning on the Earth constitutes a constant current of 1.00 kA between the... Problem 27.37P: In a hydroelectric installation, a turbine delivers 1500 hp to a generator, which in turn transfers... Problem 27.38P: A Van de Graaff generator (see Fig. 25.23) is operating so that the potential difference between the... Problem 27.39P: A certain waffle iron is rated at 1.00 kW when connected to a 120-V source. (a) What current does... Problem 27.40P: The potential difference across a resting neuron in the human body is about 75.0 mV and carries a... Problem 27.41P: Suppose your portable DVD player draws a current of 350 mA at 6.00 V. How much power does the player... Problem 27.42P: Review. A well-insulated electric water healer warms 109 kg of water from 20.0C to 49.0C in 25.0... Problem 27.43P: A 100-W lightbulb connected to a 120-V source experiences a voltage surge that produces 140 V for a... Problem 27.44P: The cost of energy delivered to residences by electrical transmission varies from 0.070/kWh to... Problem 27.45P Problem 27.46P: Residential building codes typically require the use of 12-gauge copper wire (diameter 0.205 cm) for... Problem 27.47P: Assuming the cost of energy from the electric company is 0.110/kWh, compute the cost per day of... Problem 27.48P: An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a... Problem 27.49P: A coil of Nichrome wire is 25.0 m long. The wire has a diameter of 0.400 mm and is at 20.0C. 11 it... Problem 27.50P: Review. A rechargeable battery of mass 15.0 g delivers an average current of 18.0 in A to a portable... Problem 27.51P: A 500-W heating coil designed to operate from 110 V is made of Nichrome wire 0.500 mm in diameter.... Problem 27.52P: Why is the following situation impossible? A politician is decrying wasteful uses of energy and... Problem 27.53P: A certain toaster has a heating element made of Nichrome wire. When the toaster is first connected... Problem 27.54P: Make an order-of-magnitude estimate of the cost of one persons routine use of a handheld hair dryer... Problem 27.55P: Review. The healing element of an electric coffee maker operates at 120 V and carries a current of... Problem 27.56P: A 120-V motor has mechanical power output of 2.50 hp. It is 90.0% efficient in converting powder... Problem 27.57AP Problem 27.58AP Problem 27.59AP Problem 27.60AP: Lightbulb A is marked 25 W 120 V, and lightbulb B is marked 100 W 120 V. These labels mean that each... Problem 27.61AP: One wire in a high-voltage transmission line carries 1 000 A starting at 700 kV for a distance of... Problem 27.62AP: An experiment is conducted to measure the electrical resistivity of Nichrome in the form of wires... Problem 27.63AP: A charge Q is placed on a capacitor of capacitance C. The capacitor is connected into the circuit... Problem 27.64AP: Review. An office worker uses an immersion heater to warm 250 g of water in a light, covered,... Problem 27.65AP Problem 27.66AP: An all-electric car (not a hybrid) is designed to run from a bank of 12.0-V batteries with total... Problem 27.67AP Problem 27.68AP Problem 27.69AP: An electric utility company supplies a customers house from the main power lines (120 V) with two... Problem 27.70AP: The strain in a wire can be monitored and computed by measuring the resistance of the wire. Let Li... Problem 27.71AP: An oceanographer is studying how the ion concentration in seawater depends on depth. She makes a... Problem 27.72AP: Why is the following situation impossible? An inquisitive physics student takes a 100-W incandescent... Problem 27.73AP Problem 27.74AP: A close analogy exists between the flow of energy by heat because of a temperature difference (see... Problem 27.75AP: Review. When a straight wire is warmed, its resistance is given by R = R0,[1 + a(T T0)] according... Problem 27.76AP Problem 27.77AP: Review. A parallel-plate capacitor consists of square plates of edge length that are separated by a... Problem 27.78AP: The dielectric material between the plates of a parallel-plate capacitor always has some nonzero... Problem 27.79AP Problem 27.80AP Problem 27.81AP: The potential difference across the filament of a light-bulb is maintained at a constant value while... Problem 27.82CP Problem 27.83CP: A spherical shell with inner radius ra and outer radius rb is formed from a material of resistivity... Problem 27.84CP: Material with uniform resistivity is formed into a wedge as shown in Figure P26.50. Show that the... Problem 27.85CP: A material of resistivity is formed into the shape of a truncated cone of height it as shown in... Problem 27.73AP
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Digital medical thermometers determine temperature by measuring the resistance of a semiconductor device called a thermistor, which has a temperature coefficient of resistivity of α = −0.0600 (°C)-1, after it has reached thermodynamic equilibrium with the patient. What is a patient’s temperature, in degrees Celsius, if the thermistor’s resistance at that temperature is 82.5 % of its value at 37.0°C (which is normal body temperature)?
Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.
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