A wire with a length 68 cm and a diameter of 9.0 cm is made of...
A wire with a length 68 cm and a diameter of 9.0 cm is made of an unknown material that has a temperature coefficient α of 4.6 x 10^(-3) C^(-1)°. At 20 C°, a voltage difference of ΔV is applied to the ends of the wire, and a power output of 18.7 watts is measured. If the diameter of the wire triples, the length halves, and the temperature increases to 50 C°, what will be the new power output across the wire when the same voltage is applied?
Homework Answers
A 2.0-m length of wire is made by welding the end of a 120-cm-long silver wire...
A 2.0-m length of wire is made by welding the end of a 120-cm-long silver wire to the end of an 80-cm-long copper wire. Each piece of wire is 0.60 mm in diameter. The wire is at room temperature, so the resistivities are as given in Table 25.1. A potential difference of 9.0 V is maintained between the ends of the 2.0-m composite wire.
A 18.0-m length of wire consists of 9.0 m of copper followed by 9.0 m of...
A 18.0-m length of wire consists of 9.0 m of copper followed by 9.0 m of aluminum, both of diameter 1.5 mm . A voltage difference of 75 mV is placed across the composite wire. The resistivity of copper is 1.68×10−8Ω⋅m and the resistivity of aluminum is 2.65×10−8Ω⋅m. A. What is the voltage across the copper part? B. What is the voltage across the aluminum part?
A cylindrical wire has length 60 cm, diameter 9.0 mm, and resistivity 3.0 x 10-4 2m....
A cylindrical wire has length 60 cm, diameter 9.0 mm, and resistivity 3.0 x 10-4 2m. When the wire is connected across the terminals of a battery, the magnitude of electric field inside the wire is 15 V/m. (a) (b) Calculate the current in the wire and the power dissipated in the wire. Include SI units with each answer. (10 points) In five minutes, how much charge passes through the wire, how many electrons are contained in this amount of...
A 18.0 m length of wire consists of 9.0 m of copper followed by 9.0 m...
A 18.0 m length of wire consists of 9.0 m of copper followed by 9.0 m of aluminum, both of diameter 1.3 mm . A voltage difference of 82 mV is placed across the composite wire. Part a: What is the total resistance (sum) of the two wires? Express your answer using two significant figures. Part B: What is the current through the wire? Express your answer using two significant figures. Part C: What are the voltages across the aluminum...
Learning Goal: Examine the dependence of resistivity and resistance of a wire on temperature and how...
Learning Goal: Examine the dependence of resistivity and resistance of a wire on temperature and how it affects the potential difference across the terminals of the wire. Introduction: A current of 65 milli-amperes (mA) flows through a wire of length L= 1.7 meters long and diameter of d= 1.15 millimeters at a temperature of T0= 20 °C; the wire's resistivity at this temperature is ρ0= 5.33×10−8 Ω ∙ m. The temperature coefficient of resistivity of the material is α= 4.6×10−3/C°....
Two pieces of 14-gauge wire (diameter=0.163cm) each are 50m in length. One wire is made of...
Two pieces of 14-gauge wire (diameter=0.163cm) each are 50m in
length. One wire is made of aluminum, the other of tungsten; both
are maintained at a temperature of 20°C. The wires are joined
together at one end to form a sign wire of 100m length. A potential
difference of 12V is applied across the length of this compound
wire. (a) What is the resistance of each 50m segment? (b) What is
the current in each? (c) What is the potential...
Calculate the ratio of the resistance of 11.0 m of aluminum wire 2.5 mm in diameter,...
Calculate the ratio of the resistance of 11.0 m of aluminum wire 2.5 mm in diameter, to 23.0 m of copper wire 1.9 mm in diameter. The resistivity of copper is 1.68×10−8Ω⋅m and the resistivity of aluminum is 2.65×10−8Ω⋅m. --------------------- A length of aluminum wire is connected to a precision 10.00-Vpower supply, and a current of 0.4132 A is precisely measured at 23.5 ∘C. The wire is placed in a new environment of unknown temperature where the measured current is...
Ch.18 #6 A length of aluminum wire is connected to a precision 10.00-V power supply, and...
Ch.18 #6 A length of aluminum wire is connected to a precision 10.00-V power supply, and a current of 0.4252 A is precisely measured at 23.5 ∘C. The wire is placed in a new environment of unknown temperature where the measured current is 0.3698 A . The temperature coefficient of resistivity of aluminum is 0.00429 (∘C)−1 Part A What is the unknown temperature?
A pin fin is made of an Aluminum (k=235W/m K) rod length 68 cm and diameter...
A pin fin is made of an Aluminum (k=235W/m K) rod length 68 cm and diameter 10 mm. If the heat transfer coefficient is 10 W/m2 K, calculate the fin efficiency. a. 27% b. 46% c. 35% d. 56% e. 97% f. None of them A 2-m-high, 3-m-wide, and 120-cm-thick wall of a house has a thermal resistance of 0.0124 ºC/W. The thermal conductivity of the wall is a. 0.72 W/mºC b. 1.1 W/mºC c. 1.6 W/mºC d. 16 W/mºC...
A tungsten wire in a vacuum has length 16.0 cm and radius 6.00 mm. A potential...
A tungsten wire in a vacuum has length 16.0 cm and radius 6.00 mm. A potential difference is applied across it. (a) What is the resistance of the wire at 293 K? (b) Suppose the wire reaches an equilibrium temperature such that it emits 90.0 W in the form of radiation. Neglecting absorption of any radiation from its environment, what is the temperature of the wire? (Note: e = 0.320 for tungsten.) (c) What is the resistance of the wire...
A cylindrical wire has length 60 cm, diameter 9.0 mm, and resistivity 3.0 x 10-4 2m. When the wire is connected across the terminals of a battery, the magnitude of electric field inside the wire is 15 V/m. (a) (b) Calculate the current in the wire and the power dissipated in the wire. Include SI units with each answer. (10 points) In five minutes, how much charge passes through the wire, how many electrons are contained in this amount of...
Two pieces of 14-gauge wire (diameter=0.163cm) each are 50m in
length. One wire is made of aluminum, the other of tungsten; both
are maintained at a temperature of 20°C. The wires are joined
together at one end to form a sign wire of 100m length. A potential
difference of 12V is applied across the length of this compound
wire. (a) What is the resistance of each 50m segment? (b) What is
the current in each? (c) What is the potential...
A tungsten wire in a vacuum has length 16.0 cm and radius 6.00 mm. A potential difference is applied across it. (a) What is the resistance of the wire at 293 K? (b) Suppose the wire reaches an equilibrium temperature such that it emits 90.0 W in the form of radiation. Neglecting absorption of any radiation from its environment, what is the temperature of the wire? (Note: e = 0.320 for tungsten.) (c) What is the resistance of the wire...
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