# Electrical Engineering - Energy and Power - Discussion

### Discussion :: Energy and Power - General Questions (Q.No.5)

5.

A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is

 [A]. 8.57% [B]. 42.85% [C]. 4.28% [D]. 85.7%

Explanation:

No answer description available for this question.

 Ankita said: (May 4, 2011) Efficiency=output/input =. 6\.7 =. 857 % efficiency =. 857*100 = 85.7%

 Vinayak said: (Aug 6, 2011) @Ankita Very nice.

 Bharat Prajapati said: (Sep 22, 2011) Ankita is Right

 Sandyachethu said: (Nov 14, 2011) Efficiency(n)=output/input Efficiency(n)=0.6W/0.7W (BOTH "w" CANCEL) n=0.8571 n%=0.8571x100 n=85.71%

 Ovii said: (Nov 19, 2011) Adding to sandyachethu: ratio is always without units so thats why both 'w' would cancel eachother.

 Elavendhan said: (Jan 3, 2012) Efficiency(n) % = (Output Power / Input Power)*100 Efficiency(n) % = (0.6W / 0.7W)*100 Efficiency(n) % = 85.71

 Hanumantappa said: (Apr 26, 2012) Efficiency =o/p/i/p=0.6*100/0.7=8.71

 Ravi Purohit said: (Jun 18, 2012) Because efficiency = output / input. = 0.6 / 0.7 = 0.857 = 0.857*100 % = 85.7 %

 Sumathi said: (Jul 13, 2012) Efficiency = Output/Input. =0.6/0.7 = 0.857. In Percentage, 0.857*100 = 85.7%.

 Latjor said: (Jan 1, 2013) Efficiency = Output / Input = 0.6 / 0.7 = 0.857. Than in percentage efficiency = 0.857 * 100 = 85.7 %.

 Sivaprakash said: (Sep 11, 2013) Efficiency = output power/ input power = (0.6/0.7)*100 = 85.71%

 Bhatruhari Swain said: (Dec 8, 2013) Efficiency = output/input. = .6\.7. = .857. % efficiency = .857*100. = 85.7%.

 Ankita said: (Jan 17, 2014) E = O/I. = 0.6/0.7. = 0.857. E OF 100 % = 0.857*100. = 85.7%.

 Ramakanth said: (Feb 12, 2014) E = output/input =output/output+losses. So in the question they have to give that losses are neglected. Then the answer is correct.

 Rani said: (Jul 9, 2014) Option D was correct because the efficiency will be calculated by using formula (output/input). So, 0.6/0.7 = 0.857. Under % = 85.7%

 Hemalatha said: (Aug 6, 2014) @Hemalatha absolutely right the answer is 85.7%.

 Baidya Nath Mohanta said: (Aug 13, 2014) Efficiency = OP/IP *100. = (0.6/0.7)*100. = 85.7.

 Jomel Voltboy said: (Apr 22, 2015) E = Output/Input*100. E = 0.6/0.7*100. E = 85.7%

 Mubiana said: (Sep 27, 2015) Efficiency = (output/input)*100. Efficiency = (0.6/0.7)*100. = 85.7%.

 Alpesh Kachhadiya said: (Apr 21, 2016) Efficiency = Output/Input. So, E =.6/.7*100. = 85.7%.

 Babloo Chandra said: (Jun 1, 2016) Efficiency = output/input. = .6/.7. = .857. % = .857 * 100. = 85.7%.

 Kaniksadgir said: (Sep 28, 2016) You gave a simple answer. Thanks @Babloo Chandra.

 Satyabrata said: (Mar 30, 2017) Efficiency = o.p/i.p * 100.

 Gambiza Absalom said: (Jan 9, 2018) Efficiency=Otput/Input X 100. = 85.7%.

 Sakthiraja M said: (Dec 12, 2018) Normally the efficiency formula is; Efficiency =outputpower/inputpower * 100.

 Dayu said: (Jan 20, 2019) eff=output power/input power * 100. So output power is 0.6w and input power is 0.7 watt. 0.6/0.7 * 100 = 85.7%.

 Alibaba said: (Jul 16, 2019) Why no one has manually solved this 0.6/0.7 to get 0.857. 06/10 ÷ 07/10. 06/10 * 10/07 cross multiplication will cancel both 10. 06/07 = 0.857, For efficiency, %age multiply it with 100. = 85.7%.

 Anomis said: (Sep 8, 2019) (0.6÷0.7)*100 = 85.7%.