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=250-230=20 -> P = (20^2)/R which will be computed from the previous equation. is this right? thanks!
oh sorry. so, i think it shouldve been R=V^2/P and V=250V while P=2000W. 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
Yes, correct up to this point. Uh, no. The problem statement asks for the power when V=230V. So just use the power you get from P= 230^2/R... and that's the final answer.