A cook plugs a 400 W crockpot and a 1000 w kettle into a 240 V power supply, all operating on directc When we compare the two, we find that Select one: a. I Crockpot > I Kettle and R Crockpot < R kettle. b. I crockpot > I kettle and Rcrockpot =R kettle. C. I crockpot < I kettle and R crockpot > R kettle. d. I Crockpot = I Kettle and R Crockpot = R Kettle.

A cook plugs a 400 W crockpot and a 1000 w kettle into a 240 V power supply, all operating on directc When we compare the two, we find that Select one: a. I Crockpot > I Kettle and R Crockpot < R kettle. b. I crockpot > I kettle and Rcrockpot =R kettle. C. I crockpot < I kettle and R crockpot > R kettle. d. I Crockpot = I Kettle and R Crockpot = R Kettle.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 25P: A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of...

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A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. (a) What is the battery’s internal resistance? (b) What power is dissipated inside the battery? (c) At what rate (in °C/min ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.300 kcal/kg • °C, assuming no heat escapes?
A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?
A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering 20.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?
A homemade capacitor is constructed of 2 sheets of aluminum foil with an area of 2.00 square meters, separated by paper, 0.05 mm thick, of the same area and a dielectric constant of 3.7. The homemade capacitor is connected in series with a 100,00- resistor, a switch, and a 6.00-V voltage source, (a) What is the RC time constant of the circuit? (b) What is the initial current through the circuit, when the switch is closed? (c) How long does it take the current to reach one third of its initial value?
A flashing lamp in a Christmas earring is based on an RC discharge of a capacitor through its resistance. The effective duration of the flash is 0.250 s, during which it produces an average 0.500 W from an average 3.00 V. (a) What energy does it dissipate? (b) How much charge moves through the lamp? (c) Find the capacitance, (d) What is the resistance of the lamp? (Since average values are given for some quantities, the shape of the pulse profile is not needed.)
A cook plugs a 1000 W crockpot and a 400 W kettle into a 240 V power supply, all operating on directc When we compare the two, we find that Select one: a. Icrockpot < Ikettle and Rcrockpot > Rkettle. b. Icrockpot = Ikettle and Rcrockpot = Rkettle. c. Icrockpot > Ikettle and Rcrockpot = Rkettle. d. Icrockpot > Ikettle and Rcrockpot < Rkettle.
Copper wire of diameter 0.259 cm is used to connect a setof appliances at 120 V, which draw 1450 W of power total.(a) What power is wasted in 25.0 m of this wire? (b) Whatis your answer if wire of diameter 0.412 cm is used?
(II) You want to design a portable electric blanket that runson a 1.5-V battery. If you use a 0.50-mm-diameter copperwire as the heating element, how long should the wire be ifyou want to generate 18 W of heating power? What happensif you accidentally connect the blanket to a 9.0-V battery?
A homemade capacitor is constructed of 2 sheets of aluminum foil with an area of 2.00 square meters, separated by paper, 0.05 mm thick, of the same area and a dielectric constant of 3.7. The homemade capacitor is connected in series with a 100.00-Ω resistor, a switch, and a 6.00-V voltage source. (a) What is the RC time constant of the circuit? (b) What is the initial current through the circuit, when the switch is closed? (c) How long does it take the current to reach one third of its initial value?
Suppose that by mistake you leave ten 50-W light bulbs turned on at your house for 24 hr. Say that the cost of electricity is 6 cents per kW · hr. (i)How many Joules are used by the ten light bulbs over the 24 hours? (ii) calculate the cost for this mistake?
The figure below shows how a bleeder resistor (R = 246 kΩ) is used to discharge a capacitor (C = 77.7 µF) after an electronic device is shut off, allowing a person to work on the electronics with less risk of shock. (a) What is the time constant? (in s)(b) How long will it take to reduce the voltage on the capacitor to 0.100% of its full value once discharge begins? (in s)(c) If the capacitor is charged to a voltage V0 through a 123 Ω resistance, calculate the time it takes to rise to 0.865V0 (this is about two time constants).(in s)
You are cooking breakfast for yourself and a friend using a 1,200-W waffle iron and a 500-W coffee maker. Usually, you operate these appliances from a 110-V outlet for 0.500 hour each day. (a) At 25 cents per kWh, how much do you spend to cook breakfast during a 30.0-day period? (b) You find yourself addicted to waffles and would like to upgrade to a 2,400-W waffle iron that will enable you to cook twice as many waffles during a half-hour period, but you know that the circuit breaker in your kitchen is a 20-A breaker. Can you do the upgrade?