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Author Question: A cook plugs a 500 W crockpot and a 1 000 W kettle into a 240 V power supply, all operating on ... (Read 156 times)

pragya sharda

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on: Jul 28, 2018
A cook plugs a 500 W crockpot and a 1 000 W kettle into a 240 V power supply, all operating on direct current. When we compare the two, we find that
 a. Icrockpot < Ikettle and Rcrockpot < Rkettle. b. Icrockpot < Ikettle and Rcrockpot > Rkettle. c. Icrockpot = Ikettle and Rcrockpot = Rkettle. d. Icrockpot > Ikettle and Rcrockpot < Rkettle. e. Icrockpot > Ikettle and Rcrockpot > Rkettle.

Question 2

A small bulb is rated at 7.50 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity a = 4.50  10-3 / C. When the filament is hot and glowing, its temperature is seven times room temperature (20 C). What is the resistance of the filament (in ohms) at room temperature?
 a. 234
  b. 1 350
  c. 2 080
  d. 4 530
  e. 5 630


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juicepod

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Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

A


pragya sharda

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Reply #2 on: Jul 28, 2018
Thank you!


juicepod

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Reply #3 on: Jul 28, 2018
Always glad to help...


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