electrical energy formula 2.0 / 5 based on 1 rating ? ScienceElectricityGCSEAll boards Created by: jack chadwickCreated on: 15-01-13 18:09 formulas If the exam say if a bulb tranfers 7000 joules a minute work out its power 7000 -------- 60 =116.6 1 of 3 formula when the exam asks how much electrical energy,in kwh,is tranferred when a 2 kw iron is use for 30 mins. 2kw ------- 2 = 1 kwh 2 of 3 formula a machine has an input power of 100kw and a useful power rating of 40 whats it efficency? 40 ----- 100=0.4*100=40% 3 of 3
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