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Power and heaters 
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#1
Mar209, 07:48 AM

P: 51

1. The problem statement, all variables and given/known data
A heater rated at 2000W operating at 250V is used on a supple of 230V. if the resistance of the heater will not be affected by temp, what is the power absorbed by the heater? 2. Relevant equations i think that the only equation to use will be P=V^2/R 3. The attempt at a solution because the resistance of the heater is its internal property, i would first compute for the resistance from: R=(230^2)/2000. afterwhich, i would compute the power absorbed by the heater through: V=250230=20 > P = (20^2)/R which will be computed from the previous equation. is this right? thanks! 


#2
Mar209, 07:57 AM

Mentor
P: 12,071




#3
Mar209, 08:20 AM

P: 51

so, the power when it operates at 230V is simply P= 230^2/R and the answer I would subtract from 2000W? is it right? thanks 


#4
Mar209, 08:28 AM

Mentor
P: 12,071

Power and heaters
P= 230^2/R... and that's the final answer. 


#5
Mar209, 09:01 AM

P: 51




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