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Lyder Skidt?
20. december 2006 af
Sannaen (Slettet)
Hvordan lyder denne problemformulering? Og er der evt. noget jeg kan tilføje ?
Problem: What is the efficiency of an electric heating coil totally submerged in water?
Existing knowledge/ Background knowledge: To determine the efficiency we according to theory need to know both the amount of energy supplied E (input) and the amount transformed into useful energy E (output). Having determined both of these quantities we can calculate the efficiency µ as
µ = …
E (input) can be calculated from the following formula we used in the NSC experiment/ report:
E (input) = m c ?T
m = mass of water
c = the specific heat capacity of water. c = 4200 J/ (kg°C)
?T = the rise in temperature. ?T = T² - T¹
Problem: What is the efficiency of an electric heating coil totally submerged in water?
Existing knowledge/ Background knowledge: To determine the efficiency we according to theory need to know both the amount of energy supplied E (input) and the amount transformed into useful energy E (output). Having determined both of these quantities we can calculate the efficiency µ as
µ = …
E (input) can be calculated from the following formula we used in the NSC experiment/ report:
E (input) = m c ?T
m = mass of water
c = the specific heat capacity of water. c = 4200 J/ (kg°C)
?T = the rise in temperature. ?T = T² - T¹
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