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Pupil
Karma Points: 52
Respect (97%):
Date Posted: 6/21/2008 12:16:09 PM  Status: Live
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Question Details:
Can someone help me with this one.....?

An immersion heater has a power rating of 600 watts. It is used to heat water for coffee. How long (in minutes) should it take to bring 1.2 L of water from room temperature (20°C) to 91°C?

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Oracle
Karma Points: 13,361
(Santa Fe Community College-New Mexico)
Date Posted: 6/21/2008 12:57:14 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
Q=mcΔT P=600 W, so Q=(1.2kg)(4.186x103J/KgC)(91C-20C)= 3.57x105 J. Then the time that it takes for the heater to do this is found with P=W/Δt or Δt=W/P=(3.57x105 J)/(600W)= 594 seconds or 9.9 minutes.
qman's Comment:
thanks, very clear
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