A certain toaster has a heating element made of Nichrome resistance wire. When the toaster is first connected to a 120 V source of potential difference (and the wire is at a temperature of 20.0°C), the initial current is 1.90 A, but the current begins to decrease as the resistive element warms up. When the toaster reaches its final operating temperature, the current has dropped to 1.5 A.  (d) Determine the operating temperature of the heating element.

Q: The dark saturation current of a solar cell is 1.7E-8 A/m?, the cell temperature is 332 K, the…

A: First find the e/KT eKT=1.6×10-191.38×10-23(332)=3.49×10-3-19+23=34.9   Ans(a) OPen ckt voltage…

Q: Q1/ The thermal contact conductance at the interface of two 1.5-cm-thick copper plates is measured…

A: Given   Thermal conductivity, k = 401 W/mK  Heat transfer coefficient, h = 19000 W/m2K

Q: 25 cm diameter steel oil pipe line located in the desert of Saudi Arabia is insulated with 9 cm…

A: INTRODUCTION :  Heat transfer is a natural phenomenon that occurs when there is a temperature…

Q: B- in figure below the plat has a width of 1 m. the heater is connected to the heater has length of…

A:

Q: If the full load copper loss of transformer is 349 W, then the copper loss at half load is given by…

A: The term load in an electrical machine implies current. And we know that copper loss is…

Q: Find the equivalent conduction resistance of the wall illustrated below. 0.5 m? Im? |(A) (C) |(D)…

A:

Q: If the full load copper loss of transformer is 310 W, then the copper loss at 75% of load is given…

A: Given data :-  Full load copper loss = 310 w  Find :-  At 75% = ?

Q: The figure below shows a conducting rod sliding along a pair of conducting rails. The conducting…

A: According to the given information we have to find the terminal speed  Therefore, as a moving force…

Q: Q1/Determine the temperature at which there is a 2 percent that an energy state 0.3 eV below the…

A:

Q: Using a conductor with a length of 17 cm and magnet with a field strength of 0.1856 T, find the…

A: Givenl=17cm=0.17mB=0.1856 Tv=23.77 m/sn=4Asked∈=?Formula∈=nBhv

Q: A 3.50 kg of ice at 0°C was placed inside a cylindrical container (k=0.300 W/m-°C), which has a…

A: To solve this problem we have used fouriers law of heat conduction, we multiplied with factor 2 in…

Q: A homeowner in Allentown, PA installs a 60° south-facing solar collector that (on the average over…

A: Given Data, Power of electric heater = 1 KW Electricity rate = $0.11 per KWh Payback period =  5…

Q: The resistance of a copper wire used to make a motor is 0.5 Ω at 25oC and 0.8 Ω at the motor’s…

A:

Q: 14-Two wires have the same length and the same resistance. One is made from aluminum and the other…

A:

Q: 1. A capacitor of 3.23µF has an area of 6.35mm^2. Determine the separation distance between the two…

A:

Q: For Heat transfer through cylinder tube wall, the temperature is to be a linear function of r…

A: Given

Q: A current of 10.7 A is maintained in a single circular loop having a circumference of 80 cm. An…

A: Given Data Current, I=10.7 A Magnetic Field, B=2.0T Angle, θ=20° Circumference, C=80cm…

Q: A 72 Ohm Coil of Wire Is Connected in Series with An Adjustable Resistor (rheostat) Whose Resistance…

A: Below is the answer to the asked question

Q: 3. In a conducting slab with uniform heat generation, the temperature profile along the thickness is…

A:

Q: A steel pipe (outside diameter 100 mm) is covered with two layers of insulation. The inside layer,…

A:

Q: What is the length of a copper tube with the heat loss of 500 Watts? A hot liquid which is 40℃ flows…

A: Find the length of copper tube.

Q: T, = 25°C, U = 1.0m/s Known: Electric current passes through a thin flat foil heater A=0.25m? with…

A:

Q: An one end of a solid object with length L has a temperature of T1 and the other end has T2.…

A:

Q: Example 1.6 Solid copper wire having a diameter of 1.63 mm is used to provide electrical…

A: We have, diameter of the cross-section of the wire, d=1.63mm=1.63*10-3m Length of the wire, l=75m…

Q: A furnace must be built with an inner layer of refractory brick (conductivity 1.27 Kcal/h mºC). This…

A: Given   Thermal conductivity, k1 = 1.27 Kcal/h mºC                                      k2 = 0.134…

Q: Most modern electrical heating and cooling devices are provided with thermostat. What is the purpose…

A: The thermostat is a temperature control devices . It is used in both heating and cooling devices.…

Q: 5) In a resistance microwelding process, the applied voltage is 3.5 V and overall contact resistance…

A:

Q: steel pipeline 2”sch 40 (k = 45W/mK) contains saturated steam at 121.1oC. the line is insulated with…

A: Given Data 2 inch, schedule 40 steel pipe thickness of insulation =25.4 mm Kins=0.182 W/(m.K)…

Q: Havard University campus has 200 classrooms and 400 faculty offices. The classrooms are equipped…

A:

Q: Determine the resistance of an aluminium coil of 174 cm as diameter consists of 14200 turns and the…

A:

Q: 8. A platinum wire having a diameter of 1.27 mm is used to boil water at atmos- pheric pressure. The…

A: Given data: d=1.27 mmTs=650°C Need to determine the value of h,q˙.

Q: Show that in the (S' o T) ZT = K statement showing the performance of the thermoelectric device, Z…

A: Write the given formula for the performance of the thermoelectric device and define the variables.…

Q: For a current carrying wire of 20 mm diameter exposed to air (h = 20W / (m ^ 2) * K) maximum heat…

A:

Q: For a current carrying wire c exposed to air (h = 20 W/m dissipation occurs when thic %3D (0.5 W/mK)…

A: With respect to the question Given values are: d=20 mm Therefore, r = d/2=20/2= 10mm h°= 20 W/m2k k=…

Q: Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals.…

A: Given Data The signal detect by the Arecibo is: P=1.2 pW=1.2×10-12 W Area of Arecibo is: A=6.0×1014…

Q: 1. To obtain power from the current in the wire of your vacuum cleaner, you place a loop of wire…

A: c. A loop of wire should be placed perpendicular to the vacuum cleaner wire to maximize the magnetic…

Q: Determine the resistance of an aluminium coil of 140 cm as diameter consists of 15800 turns and the…

A: GIVEN THAT :  aluminium coil diameter (d) = 140 cm N = 15800 turns  mean length per turn  (Lm) =…

Q: Nonmetallic-Sheathed Cable (NM) shall be permitted to be derated from the 90 degrees C temperature…

A: Non metallic sheathed cable shall be permitted to be derived from the 90degrees C temperature rating…

Q: Calculate the efficiency of a solar module with the given parameters: • FF = 59% Voc = 5.5 V • Isc =…

A: Write the expression of the input power. Write the expression of the output power.

Q: Q4) a-In your own words, explain in details the effect of changing polarity on the dielectric…

A: (a) The dielectric constant is basically defined as the ability to polarize a material under the…

Q: Unit of thermal conductivity in S.I. units is (a) J/m2 sec    (b) J/m °K sec (c) W/m °K    (d) (a)…

A:

Q: :The transformer Iron losses is .Constant independent of the applied voltage O .A linear function of…

A: Soln :- The transformer iron losses or hysteresis and eddy current losses remain constant for…

Q: B. k/p.Cp D. p.Cp/k he end insulated fin are: В. To at x-0 dT -kA dx

A: introduction : here we answered first three part

Q: The coil relays take a current of 0.12 A when it is at the room temperature of 15°C and connected…

A:

Q: he heat loss per hour through 1 sq. ft of furnace wall 18" thick is 520 Btu. The temperature on the…

A: Given Data⇒ Thickness of wall(t)=18'' Since we know that 1 inch=0.0833333 ft Hence t=1.5 ft Area…

Q: A material which conducts electricity only at high temperature is termed as _______________.

A: Semi-conductors are the material that can only conduct electricity at a high temperature.…

Q: Which material will transfer more heat? Either a material with thermal conductivity k = 121W/m°C' or…

A: Given: The thermal conductivities of the two materials are, k=121 W/m°C k'=22 W/m°C.

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.