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CBSE Class 9 Answered

a transformer is used to light a120W 24v lamp from 240vac mains. the current in the main cable is 0.6A. the efficency of transformer is;;
Asked by ujjwalviky2003 | 01 Nov, 2017, 07:36: PM
answered-by-expert Expert Answer
begin mathsize 12px style
Power equals space voltage space straight x space current

straight n equals fraction numerator output space power over denominator input space power end fraction
equals fraction numerator 120 over denominator 0.6 straight x 240 end fraction
equals 0.83

efficiency equals space 83 percent sign end style
Answered by Gajendra | 06 Dec, 2017, 02:59: PM
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