A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.92 Ω. (a) Calculate the power (in W) consumed by the heater. W (b) How many minutes would it take to heat 1.13 kg of coffee from 20.6°C to 46.2°C with this heater? Coffee has a specific heat of

A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.92 Ω. (a) Calculate the power (in W) consumed by the heater. W (b) How many minutes would it take to heat 1.13 kg of coffee from 20.6°C to 46.2°C with this heater? Coffee has a specific heat of

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 57PQ

See similar textbooks

Similar questions

Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?
Lightbulb A is marked 25.0 W 120. V, and lightbulb B is marked 100. W 120. V. These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120.-V source. (a) Find the resistance of each lightbulb. (b) During what time interval does 1.00 C pass into lightbulb A? (c) Is this charge different upon its exit versus its entry into the lightbulb? Explain. (d) In what time interval does 1.00 J pass into lightbulb A? (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at 0.110 per kWh.
Consider a portable electric blanket that runs on a 4.5 V battery. If you use copper wire with a 0.5 mm diameter as the heating element, how long should the wire be (in unit of meters) if you want to generate 15 W of heating power? (Take the resistivity of the copper wire as p= 1.7 x 10^(-8) Ω.m)
A 120 V potential difference is applied to a space heater whose resistance is 13.7 Ω when hot. At what rate is electrical energy being transferred to thermal energy? How much thermal energy is produced in 9.1 hours?
In a tDCS treatment procedure, 0.85 mA of current flows through a patient’s brain when there is a 7.4-V potential difference between the electrodes. Whatis the equivalent resistance between the electrodes?
A 660 W electric heater is designed to operate from a 120 V source. If the source voltage drops to 80.0 V, what will be the power dissipated by the same heater? (Assume the resistance of the heater is constant.) a. 440 W b. 660 W c. 293 W d. 73.3 W
How much current flows thru a 6 Ω resistor in 4 minutes if it is connected to a 9V battery ?
The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 20-gallon (1.00 gal = 3.79 x 10-3 m3) unit starts with water at 14 °C and delivers hot water at 55 °C. The unit is electric and uses a resistance heater (120 V AC, 3.4 Ω) to heat the water. If water has a specific heat capacity of 4186 J/(kg°C) and a density of 1000 kg/m3, and assuming that no heat is lost to the environment, what is the recovery time of this hot water heater?
A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 124 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)^−1. Express your answer to two significant figures and include the appropriate units T=
An electrical space heater uses coils of Nichrome wire to produce heat. Nichrome has a resistivity ofρ = 1.0 × 10−6 Ω · m. When plugged in to a regular household socket providing 120 V, the space heater uses 1400 W of power. If the wire has a diameter of 1.00 mm, how long is the piece of the wire? [Answer: l = 8.1 m]
A cell phone operates on a V = 3.61 V battery. If the resistance within the circuitry of the phone is R = 15.4 Ω, what power does it consume? Your answer should be in watts (W).
A battery has an emf of 10.0 V with an internal resistance of 0.0400 Ω. Its terminals are connected to a network of resistors with equivalent resistance of 2.00 Ω. What is the power delivered to the network? 49.0 W 47.0 W 50.0 W 48.0 W