If the length of a heater wire of 1000W, 220V is reduced by 20% then what is the power consumption?
Asked by tangocharliee | 10th Nov, 2009, 11:11: PM
P = V2/R and R L.
20 % reduction in L means the reduction in R.
Hence the new Rn is 0.80R i.e. 80% of initial R.
P = V2/Rn = V2/(0.8R) = 1250 W since V2/R = 1000 W.
Answered by | 11th Nov, 2009, 10:49: AM
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