a coil is to be used as an immersion heater for boiling water. the coil is to op

Question

a coil is to be used as an immersion heater for boiling water. the coil is to operate at 120 V and is to heat 250 cm^3 of water from 20 degrees Celius to 100 degrees celius in 8.0 minutes. the specific heat capacity of water is 410J/Kg.degrees Celius. the coil is to be made of 25.0cm^3 of Nichrome that will be formed into a wire. what must be the total length of the wire used to make the coil, and what must be the redius of the wire? assume that the wire has a circular cross section and that the volume of the Nichrome is unaffected by the process that forms it into a wire.

Explanation / Answer

power for heating the water : 250*4.18*(100-20) = 83600 heat emitted by the coil = V2/R *t = 1202/R*(8*60) 1202/R*(8*60) = 83600 R = 3.58*10-4 O

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