A coiled wire is to be used as an immersion heater for boiling water. The coil should operate at 220 V and is to heat 250 cm3 of water from 20° C to 100° C in 6.0 min. The specific heat capacity of water is 4190 J/(kg C°). a) What must be the resistance of the coil be (assumed as temperature independent)? b) What is the current flowing through the wire?

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
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A coiled wire is to be used as an immersion heater for boiling water. The coil should operate at 220 V and is to heat 250 cm3 of water from 20° C to 100° C in 6.0 min. The specific heat capacity of water is 4190 J/(kg C°). a) What must be the resistance of the coil be (assumed as temperature independent)? b) What is the current flowing through the wire? 

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