A well-insulated electric water heater warms 131 kg of water from 20 °C to 43 °C in 30 minutes. Find the resistance of its heating element, which is connected across a 240 V potential difference. The specific heat of water is 4186 J/(kg °C). R =

Q: A light bulb is connected to a 120.0-V wall socket. The current (in Amperes) in the bulb depends on…

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Q: A toaster has a Nichrome (a=4.5×104 °C-) heating element that has a resistance of Ro= 80 2 at a…

A: The relation between the resistance and the temperature is given by, Here, R, Ro, T, To and α…

Q: A teapot with a surface area of 715 cm is to be plated with silver. It is attached to the negative…

A: Surface area (A) = 715 cm2Potential difference of the battery (V) = 12 volts Resistance (R) = 1.5…

Q: What current (in A) must be produced by a 12.0 V battery-operated bottle warmer in order to heat…

A: Given data: Potential difference ΔV= 12 V Mass of glass mg=74 g=0.074 kg Specific heat of the glass…

Q: A coil of wire has a resistance of 55.8Ω at 26 °C and 54.1Ω at 61 °C. What is the temperature…

A: Initial temperature To = 26oC Final temperature T = 61oC Initial resistance Ro = 55.8 ohm Final…

Q: What current (in A) must be produced by a 12.0 V battery-operated bottle warmer in order to heat…

A: Mass of glass = 70 g Mass of baby formula = 200 gMass of aluminum = 350 g Initial temperature = 20oC…

Q: An engineering intern is studying the effect of temperature on the resistance of a current carrying…

A: Consider the first case,  initial temperature, T = 20 oC Final temperature, T1 = 54 oC Change in…

Q: As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a…

A: At T=20°, the resistance of the rod is given by R20=ρ20l20A

Q: For a medium-well steak, the FDA recommends steak to be cooked to the temperature of 145 degrees F.…

A: Due to the flow of the current through the circuit, there is some heat that will be produced…

Q: The heating element of a coffeemaker operates at 120 V and carries a current of 5.50 A. Assuming the…

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Q: The heating element of a coffee maker operates at 120 V and carries a current of 3.50 A. How long…

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Q: A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 2 ℃, the…

A: The carbon resistor at a temperature T0=20C The resistance of the carbon resistor  R0=215 Ω…

Q: a batch of parts is plated with copper in an electrolytic bath running at 0.20 V and 12.0 A for…

A: Given: Voltage V=0.2 V Current I=12.0 A Time t=3 hrs Energy cost =5 per KWh   To find:  Total energy…

Q: A light bulb has resistance of R = 150 Ω and has a current of I = 1.1 A passing through it. Express…

A: Power P is given By -  P=V×I, Where, V=voltage  I=current  According to ohm's law,      V=I×R , So,…

Q: At room temperature (27.0 °C) the resistance of a heating element is 100 2. What is the temperature…

A: Given that - room temperature Resistance at room temperature Resistance at increased temperature…

Q: To what temperature must you raise a gold wire (c = 0.0034), originally at 20.0°C, to double its…

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Q: the heating element on an electric heater dissipates 4.0 x 10^2 watts of power when connected to a…

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Q: A student finds two ancient meters with numbered scales but no unit markings. He thinks that one is…

A: according to Ohm's law, we can say that V=IR the voltmeter always has higher resistance than the…

Q: A certain lightbulb has a tungsten filament with a resistance of 18.5 N when cold and 136 N when…

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Q: What current (in A) must be produced by a 12.0 V battery-operated bottle warmer in order to heat…

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Q: The heating element of a coffeemaker operates at 120 V and carries a current of 5.00 A. Assuming the…

A: Given data:  Voltage (V) = 120 V Current (I) = 5.00 A Mass (m) = 0.300 kg Initial temperature (Ti) =…

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Q: At room temperature (27.0 °C) the resistance of a heating element is 100 2. What is the temperature…

A: We have,Room temperature, T=270CResistance of the heating element at T, R=100 ΩLet T1 is the…

Q: An electric motor winding uses 1800 m of copper conductor with a cross-sectional area of 0.26 cm2.…

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Q: A 150 W heating coil (like a light bulb) is designed to operate from 125 V. The coil is made from a…

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Q: A toaster has a Nichrome (oa-4.5x10 °C) heating element that has a resistance of Ro- 80 2 at a…

A: Given: Temperature coefficient of resistance of given wire: α=4.5×10-4 [°C-1] Initial resistance of…

Q: A tungsten wire has a radius of 0.093 mm and is heated from 20.0 to 1322 °C. The temperature…

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Q: Solve the following problems with complete solutions and units using 2 decimal digits: The tungsten…

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Q: The heating element of a coffeemaker operates at 120 V and carries a current of 2.50 A. Assuming the…

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Q: A light bulb has a resistance of 95 Ω when operating at 120 V.  How much energy is given off by the…

A: Given  Resistance(R) = 95Ω voltage(V) = 120V time(t) = 1day = 86400sec  (∵1day = 24hrs=24×60min =…

Q: A 4μF conductor is charged to 400 V and then its plates are joined through a resistance of 1kQ. The…

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Q: A 120 V potential difference is applied to a space heater whose resistance is 13.7 Ω when hot. At…

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Q: The copper windings of a motor have a resistance of 46 Ω at 20oC when the motor is idle. After the…

A: Initial resistance of copper windings (r) = 46 ohm initial temperature of the copper windings (t) =…

Q: What is the required resistance of an immersion heater that increases the temperature of 1.50 kg of…

A: Write the given values with the suitable variables. m=1.50 kgT1=10 °CT2=50 °Ct=10 min=600 sV=110 V…

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Q: A cell of e.m.f. 2V and external resistance 0.5 Q is connected across a resistor (R). The current…

A: To find-Thhe value of external resistance=?Given-Emf (E1)=2VInternal reistance (r1)=0.5 ohmEmf…

Q: A common flashlight bulb is rated at 0.30 A and 2.9 V (the values of the current and voltage under…

A: Given V at Operating temperature- 2.9V Current at Operating temp- 0.30A R1 = Resistance at room…

Q: A water heater that is connected across the terminals of a 15.0 V power supply is able to heat 250…

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